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Bryan,

I have had my new LCD-90 up and running continuously now for a few days and love it!!

I can tell that you have put quite a bit of effort into the design of this unit. Its power supply flexibility and extremely long battery life make it a serious field instrument. It also feels good and has solid, high-quality buttons. It's not often that one encounters such beauty of design. This is truly a field/survival type of device. Thanks for making it available.

I also like the fan-filter assembly. I have generated my first decay curve and then performed a pseudo curve matching exercise with an apparent high degree of agreement. See the attached gif file.

What is the significance of 16% Pb-212? Does the Pb-212 level indicate anything about the source of radon? Does it indicate the presence of thoron gas?

I will now be conducting a long series of tests to determine how various modes of operation of our heat recovery ventilator effect radon levels. It'll be interesting to see how high it goes when I turn off the unit.

Thanks again for the fine product.

Tom Phillips

Tom's decay curve

Hi Tom,

Thank you for the kind comments about the LCD-90. Yes, as per the makedecay manual, the 16% Pb-212 indicates Thoron is near by and its daughter Pb-212 accounts for ~ 16% of the activity seen on the filter.

Bryan


Dear Bryan ~

Just thought I would let you know that I received the Aw-Radw software for Windows along with the USB-MSP interface that I ordered. This is a great system which serves my purposes perfectly. Many thanks for your help and for these fine products!

Kind regards,
Dick Schaus


Greetings,

About 5 years ago, I purchased an RM-60 and the AW-RADW software for my son to use for a science fair project. Since that time he has used it a number of times for his science work including studying radon daughters, triboplasma x-ray sources, and a home built fusion reactor. The device continues to work fine and the software still runs on a pc. Even as he has accumulated additional detection equipment for his advancing work including scintillation detectors and BF3 and Li6 neutron detectors, he still pulls out the RM-60 when he wants to record gamma and x-ray counts for analysis.

I notice from your website that AW-RADW purchasers are able to get software updates upon request. Currently our version is 7.5(b). Can I get instructions for downloading the latest version?

Thanks,
Jim K

Hello Jim,
Nice to hear about the advancment of your son.
(update instructions)
...

Thanks Bryan.

My son Mike and I find occasion to recommend your products to like minded amateur scientists from time to time. Your affordable product has helped me introduce my son to science concepts that get very little treatment in schools. He is a senior in high school now and is making plans for either nuclear engineering or applied physics studies in college.

Regards,

Jim K


From an AOLer:

Several months ago, I purchased the RM-60 and hooked it up to an old laptop in the basement as a sort of early warning detector in the event of a radiological disaster. I quickly forgot about it in my daily routine.

A while later my father in law suffered a heart attack which got me thinking, maybe I should be tested myself. So the day arrived and all went well. Until I returned home, that is. Pumped full with 35 millicuries of Technetium I pulled in my drive and set off the alarm which is set at 50 micro roetgens/hr.

Obliviously I went into the basement and gasped when I saw the display indicating 58 micro-roentgens/hr ( I have it set so that each column displays one hours average ) the alarm was wailing. The average in my basement is about 21. I've never seen it more than about 30. Puzzled I picked up the RM-60 unit and watched the display jump to more than 8500 micro-roentgens. I felt the adrenaline flow, and I wondered out loud: are we under attack?

Then it occurred to me, the marker you moron. As I held it to my chest the laptop showed an incredible 31549 micro-roentgens. Holy crap, I'm radioactive! I'm very impressed how reliably your product works. It sat down there quietly doing its job until I tooled up the driveway glowing like a lightstick and alarmed before I even got in the door. It has piqued my interest in nuclear science all over again. As I sit here eleven hours later it is sitting on my end table with the LX200 clicking away at 5389 micro-roentgens ( the LX200 is set with 10sec TBU ).

Thanks for an excellent product.


From: Russ George r-george@pacbell.net

Bryan,

The RM-80 arrived here in good shape and I've made very good use of it.

I have a question for you. Have you ever calibrated one of these for neutrons using a silver foil to catch the neutrons and re-emit a prompt gamma. I would surely like to have some idea of the efficiency of the RM-80 under such circumstances. One recent experiment using the RM-80 and 0.25mm silver foil resulted in a many thousand fold enhancement of counts. I suspect this equates to a huge neutron flux as I cannot imagine the counter efficiency of the GM+Ag is even 1%.

Russ George
Palo Alto

From Randall

Hello

I have been using an RM-60 and your suggested fan arrangement to monitor radon for many years. It has been instrumental in my efforts to reduce radon levels in my home. I have found that the radon levels are very much dependent on the difference between the indoor and outdoor temperature. For example, I have found a good correlation between radon and outdoor temperature with the following simple formula:
radon (pc/l) = A x (Indoor Temp - Outdoor Temp) - B
where B is in my case 3 pc/l and the coefficient A has decreased from about 0.6 without remediation to about 0.16 currently with remediation. Using max and min temperature data from the PA climatologist's web site allows me to make plots on Excel of measured and expected radon based on temperature as functions of time.

My calibrations with carbon and alpha track detectors (at least 3 different calibration runs) have led me to the following conversion from MicroR/hr to pc/l:
radon (pc/l) = (MicroR/hr - 12)x 0.8
The 12 is essentially the average assumed background radiation that I measured by using the monitor outdoors with no fan. I know the background radiation varies with time (I have seen numbers between 10 and 13). I assume it is fairly uniform over large regions of the earth's surface, however. Does someone measure this and make it available to the public? I would like to try refining my system by accounting for this variation.

Randall,

Your E-Mail is very interesting. Perhaps somebody will read it on our website and let us know about such a database at which point I'll E-Mail you.

From: Paul.Sawyer@tellabs.com
Subject: My RM-70

Hi,
I recently cleaned the window of my RM-70 - and in doing so have removed what appeared to be an ink like coating on it ...

Have I broken/de-calibrated it ? What was the function of the coating, and should I replace it with something -
Thanks,
Paul Sawyer
psawyer@tellabs.com

From: boardmanb@aw-el.com [SMTP:boardmanb@aw-el.com]
To: Sawyer, Paul /bb,its
Subject: Re: My RM-70

Paul,
The coating is graphite powder. It is there to filter out ultraviolet rays. Once a user did the same thing to his RM-80. He sent it back to us for re-coating but when I had it here, before re-coating, I held it in direct sun light with no detection of ultraviolet at all so I would say your RM-70 is fine without the coating.

(Note for RM users: To clean dust from window use "canned air" from Radio Shack or-the-like normally used to blow dust off lens).

Hey, BTW -

Don't know if you'd be interested in this for your "experiences" page, but the reason I was cleaning it was because I had gotten some dust on it -

The dust came from my water softener - I was using a potassium based salt in it that is supposed to be better for you than the sodium based stuff - I had set my RM-70 near the softener tank and all of a sudden it was reading about 6x background - I came to find out that potassium-40 is radioactive - with a huge half life too. There must be a significant concentration of it in the salt I bought. I informed the Illinois Dept. of Nuclear Safety - they didn't seem to be too concerned, although I did let them know also that a lot of this stuff comes out as dust when you pour the bag into the tank - probably not good to breath.... You can still buy this stuff in the stores - I've got half a mind to take the RM-70 to the store sometime to see what the reading is like around the pallets that they stack it on. I long ago switched back to sodium based softener salt !

Paul Sawyer


Hi Brian

A few years back, when I was still living in St. Pierre et Miquelon, I bought a RM 70 with the graphing software. Since 1997 I've been working and living in Newfoundland, employed as an avionics instructor in the local college aircraft maintenance engineering program.

I hadn't used the RM 70 very much recently, but today I decided to take it to work just to see how radioactive the dials were on some of the old aircraft instruments. To my surprise the radiation levels were much higher than I expected, even half a metre or more away from some of the instruments, even though they were inside a closed plastic container, and in one case they were in a closed metal locker. I had only used the earphone adapter for a quick sweep of various locations in the college where these instruments were located.

Ron


Sirs;

I've been using an RM-60 for quite a few years (since the early 90s) in my vacuum lab for monitoring x-ray emissions from various pieces of apparatus and it's been a good investment for safety. It has so far outlasted the ancient laptop that I'd had dedicated to it (no hard drive and I don't think it was even 286 level). It's now running on a salvaged 486.

Steve


Dear Aware,

I purchased one of your units several years ago and have enjoyed using it. The first time I tried it I was on my way from Melbourne to London and startled my fellow passengers when the alarm on my laptop went off when it intergrated the first data point!

Some data I have measured appears on my home page:
http://www.ph.unimelb.edu.au/~dnj/dnj/buffrad.htm
Assoc. Prof. David N. Jamieson Director:
Microanalytical Research Centre
School of Physics
University of Melbourne

More from Prof. Jamieson:

Many thanks for your fast response. The new software worked fine on my new laptop (after I reclaimed COM1 from the IR port!).

I have attached a radiation profile I took a few years ago of a flight from Sydney to Melbourne. Notice I turn off the apparatus during takeoff and landing. But I have never been able to find a satisfactory explanation for the two intense spikes seen upon boarding and deplaning. The inverse square law rules out radioactive cargo. I have never seen them again on other flights. Prof. Jamieson's graph:

Jamieson

From: Brandon Nuttall
Subject: Re: Question on brazil nuts

Bryan,

Thanks for the info and the update on the MAKDECAY software. I have zipped and attached the file of background radiation data collected from my office. As I mentioned, there is a spike during the holidays when the building was closed. The last scheduled workday of the year was 24-Dec-1997. The building was closed and the ventilation system turned off late that evening. The average measured background increased to a peak on 31-Dec-1997. The ventilation system was started again on 1-Jan-1998 (a holiday) in preparation for a return to work on 2-Jan-1998.

Something else I noted of interest was a daily trend in rising and falling background background radiation levels. First, I used SECTION to extract the data from noon on 27-Oct-1997 to noon on 2-Nov-1998. Then, using AW-Graph, I displayed the data with a compression factor of 360 (equal 6 hours). Zooming in, it was easy to see a daily peak background radiation level occurring generally between 4 and 6 am and a daily minimum about 12 hours later (about 5 to 7 pm). I related this generally to daily usage patterns of the building. This is an observation and a guess. Neither have been tested beyond zooming in on several different parts of the curve and seeing of the pattern holds up.

In the zipped file, I have included a README file that describes my setup. (README follows plot).

Brandon

19-Jan-1999

This file describes a background radiation data set gathered in the office of Brandon C. Nuttall, Kentucky Geological Survey with an Aware Electronics RM-60 Pro Micro Roentgen Radiation Monitor. The monitor was attached to a laptop PC running Microsoft Windows 3.1 and Microsoft Disk Operating System (MS-DOS) version 5.0. The program AW-MRAD was installed as a TSR using the AW-AUTOT.COM utility at system boot.

The building is a three-story concrete and steel structure with a brick exterior built in 1988. Windows do not open. Ventilation is by forced air. The office is located on the third floor with windows facing approximately northwest.

The monitor was placed inside a plastic ziploc-type bag as a dust protector. Short term experiments (approximately 1 day each) had shown there appeared to be no significant difference between background readings acquired by the unit in or outside of the plastic bag. Monitor and laptop were placed on a table near the middle of the office with the detector window facing the door.

The header from the data file included:
Brandon C. Nuttall, bnuttall@kgs.mm.uky.edu, background in office
Start: Mon Oct 27 09:47:15 1997
End: Mon Nov 02 14:16:15 1998
Total time: Days:371 Hrs:4 Mins:29
Min: 0 microR/hr First-Last: Thu Mar 19 15:40:15 1998--Sun Jul 19 05:51:15 1998
Max: 31 microR/hr First-Last: Sat Nov 01 06:19:15 1997--Sat Nov 01 06:19:15 1997
File's Time Base Unit (TBU): 60 secs. TBUs per point: 1
Average microR/hr: 11.39

Data submitted by:
Brandon C. Nuttall
Kentucky Geological Survey
228 MMRB
University of Kentucky
Lexington, KY 40506-0107 bnuttall@kgs.mm.uky.edu


From: "Phil C. Stuart"
Subject: My radioactive vacation
Mime-Version: 1.0

Hi:

I bought one of your RM-60's a couple of months ago to use on my vacation. I hooked it to a homemade microcontroller based "computer" and recorded the radiation levels during the trip as I drove through Texas and New Mexico. I also stored data from a GPS receiver and thus could see the effects of altitude etc. At my final destination, I used it to map the radiation around ground-zero at the Trinity Site where the World's first atomic bomb was exploded. The unit worked flawlessly and I thought you might like to see the results. If so, you can go to...
http://www.randomuseless.info/vacation/vacation.html
Phil C. Stuart
stuart@randomuseless.info"

Phil's Plot


From: "Clifford J. Bland" cjbland@acs.ucalgary.ca Reply-To: cjbland@acs.ucalgary.ca Organization: University of Calgary
Clifford

Professor Bland carried out a walk through survey of the minerals and gems section, Glenbow Museum, using an RM-70 + H.P. 200LX palmtop PC. A spreadsheet program was used to plot the above data.

From: Edmond Holroyd eholroyd@ibr8gw80.usbr.gov
To: boardmanb@aw-el.com
Subject: Re: RM-80 - Reply

On Saturday I took the new RM-80 to Dinosaur Ridge and tested it on the radioactive dinosaur bones. The unit responded very well and is very suitable for my demonstrations. The sound system shows a significant increase in counts above background. I am therefore pleased.


From: Klaus Halbach
Subject: RM-70
Mime-Version: 1.0
Dear Brian,
As you will see below, I put my RM-70 to some interesting use, and I thought you might find it interesting since you describe a wide range of applications.
1) I recently had some Thallium (Tl 81/201, half life=73 hours) injected to get a picture of my heart. For several days I kept track of the radiation coming from my chest, and by multiplying with the appropriate exponential to reduce all readings to the same point in time, I could follow how the material (quite slowly, but measurably) was flushed out of my body.
2) I also had Technecium (Tc 43/99m, half life 6 hours) injected to look for cancer metastases in my bones. At home I put my RM-70 on my right/left hips and shoulders, and got a 2.5 times higher count rate at my right hip, confirming the radiologists report that my prostate cancer is attacking that area, and explaining the pain I have there.
3) In both cases the count rates were, for a while, quite high, substantially above the background here (15 c/min). With these high rates I would have been happy (for count rate correction) to know what the dead time is after each recorded event. Do you know roughly what it is? I know how to determine it experimentally, but it would be nice if you could save me the work.

Sincerely,
Klaus H.
Klaus Halbach
Sr. Physicist, Emer.
Lawrence Berkeley National Lab.

Klaus,
Personal aspects aside, very interesting experiment. Of course it goes without saying, may vast recuperative force be with you!

The dead time of RM-70 is approx. 80 microseconds. Also see www.aw-el.com/fetch.htm for "Raw count-rate during decay of 15 mCi of 99mTc. Each point is the average of 10 1-minute acquisitions, without subtraction of background. Marked points represent idealized count-rate values based on extrapolation of the 24 hour measurements. Measured count rate is 5% less than that predicted at the highest count-rates". Given the same count rate, the data should apply to RM-70 as well, although since RM-70 tube is bigger, perhaps its deadtime is a little larger.

Should I place your E-mail on our web site at: www.aw-el.com/email.htm with E-mail address?

Dear Bryan,
Thank you for the dead time information. Because of unexpected health problems I have not been able to absorb all the other information you sent, but will read + respond to it when things get less hectic. Yes, it is ok to put the description of my use on the net, with name + e-address. If it leads to too many responses that I should answer to, I can always answer with a generic letter. Another obvious use of the RM-70 may be monitoring radiation therapy with radioactive implants.
Best regards, Klaus.


To: Bryan Boardman, Aware Electronics, Wilmington, DE From: George (Sassoon) geosas@aol.com

...
I took an old farm gate hinge, a strip of rusty mild steel (presumably) about 2.5" wide x 1/4" thick, and built up a big fat weld on it about 2" dia. I then plunged it into water, and as soon as cool enough placed it with the weld upwards and one of your RM-80 detectors on top with the alpha window over the weld. I had left it going half an hour in this position to establish background.

I know that the flux coating of the welding rods is slightly radioactive, so expected an immediate increase, and this happened. What I was looking for was a short term decay after the initial rise, indicating that short-lived radionuclides might have been formed while welding.

This may have happened, but the effect was too small to be seen clearly, if it happened at all. Saying "what the hell", I left the experiment running anyway.

A day or two later I checked it and saw to my surprise that the radioactivity was actually rising! (See attached file WELD01.GIF). The time constant appears to be 3 - 4 days. Could this be due to due to flux diffusing slowly out of the weld, or what?

I intend to repeat this experiment, and would be glad if you could suggest to other users of your instruments that they might try it.

With best wishes, George (Sassoon) geosas@aol.com

George's Weld
Dear Bryan,

I am repeating the experiment of measuring the radioactivity of a fresh weld in mild steel, and this time I stirred in some salt and sugar so as to add Na, Cl, C, H and O to the general mess!

I got a slight but real, (I think!) decay over the first few hours, then it flattened off and is now starting to rise again 24 hours later. The initial reading this time was higher: 30 uR/hr., background about 15.

I put a second RM-80 detector underneath the steel strip, the other side of the weld, alpha window upwards, to see if any radiation came through the thickness of the steel (about 1/4" - 3/8") but this just seems to be registering background.

More From George...
NOTES ON EXPERIMENTS ON RADIOACTIVITY IN WELDS


Dear Bryan:

This is Greg Shanos from sunny hot & humid Florida. I recently purchased your RM80 geiger counter. I absolutely love it. I am an amateur astronomer by passion. I also collect meteorites. The meteorite dealers are currently selling TRINITITE. This is the fused sand from the first atomic bomb explosion at the Trinity site in New Mexico. They say it's radioactivity has all but decayed. Not so. I measured the radioactivity at 314.62 uR/hr (500 data points) The background was 8.13 uR/hr at 500 data points. Is this dangerous? I have been keeping it under a lead photographers travel bag for the last few years. I addition, its in the garage.

Can you send me some information regarding roentgen levels that would be dangerous to your health. I would also appreciate the conversion factors for Roentgen to curies etc. GShanos@aol.com

Greg, A rule of thumb: One Curie of Radium (1 gram) in equilibrium with its decay products, at one meter generates one Roentgen per hr. Perhaps, from time to time, Mme. Curie worked with this much material (possibly spread out over say a crystallization pan).

I would say, don't breath dust from the TRINITITE and perhaps wash your hands after handling it.

A stipulation one sees in various regulations, for example in regards to people working with radioisotopes: no more than an average of 500 microR/hr. for an eight hour work day. For X-ray emission from TVs: no more than 500 microR/hr. at a distance of 5 cm. from the screen or case.
Bryan



Ira A. Wilner
** WILNER ASSOCIATES **
Broadcast Engineering Services
Email: bdcst@vermontel.com
URL: http://www.vermontel.com/~bdcst
Hello Brian,

I thought you might want to know about my success with running your radiation software AW-SRAD, etc. on an old Toshiba T100X pen computer. These machines, the size of a textbook or ring binder, were popular around 1993-94. And they were expensive. Today a few remaining units are being sold over the Internet for under $200. They have 4 meg of battery protected RAM, a tiny 40 meg hard drive, two PCMCIA-II card slots, a serial and a printer port.

They have no floppy drives. An external drive, still available, costs over $200! Fortunately the computers are loaded with Windows 3.1 for Pen computing and DOS 6.0. DOS has a utility for linking computers through either a printer or serial port. So I was able to download your software to the pen computer, set up PIF files in Windows and run them.

You might say, so what is the big deal? Well, pen computers do not have keyboards. The Toshiba does have a PS-2 keyboard port. But for portable use dragging around an accessory keyboard is not attractive. Fortunately the Windows pen system (actually a large digitizer the size of the LCD screen) will paste keystrokes into any windowed DOS program.

The T100X has a monochrome VGA screen easily readable in bright daylight without the backlight on. So for under $200 I now have a data logger and portable power source for my RM-70 among other things. And it can run a web browser or email client too, albeit slowly.


Subject: Radioactivity in seaweed From: George (Sassoon) geosas@aol.com

Dear Bryan,

This is an interesting experiment you could suggest to your environmentally-concerned users of AW-EL equipment:

Recently we had a hurricane here in W. Scotland and a lot of seaweed was washed up. I collected some stems of the type known as 'tangle' locally, Latin name Laminaria I think, which has long stems with a bunch of green-brown fronds at the end, a bit like a palm-tree. I trimmed the fronds off and left the stems outside in the rain to wash the worst of the salt off for a few hours. They are several feet long, with a bunch of knotted roots where they attach themselves to the rocks.

I propped one of the stems up in the kitchen alongside the Aga cooker, with a RM-80 detector unit on the floor by the root end, on its side, with socket uppermost and alpha window close to the root. The LCD-60 unit was connected to the RM-80 and showed 1059 counts after 23 minutes (46.04 counts/min.)

Timing was by the quartz-controlled kitchen clock which has a second hand.

At this point the seaweed was removed without touching anything else. After a further 23 min. the count was 2002, average counts/min. = (2002-1059)/23 = 41.0 background, so the seaweed had added 5.04 counts/min. I then replaced the seaweed root, not necessarily in the same position.

After a further 10 min. the count was 2485, giving a mean count rate for background+seaweed of (2485-2002)/10 = 48.3 counts/min.

So there is no doubt that the seaweed contains something radioactive. Natural or man-made? It is known that nuclear explosions produce radioactive iodine isotopes, and that seaweed accumulates iodine.

The next question is: is there any point in taking counts along the stem of the seaweed? Does it grow in such a way that a certain distance along the stem corresponds to a certain point in time? Maybe a marine biologist can help (Joanna S. in Perth - know anyone?)

Here in W. Scotland we are lucky in that the Gulf Stream brings us water from the Caribbean, but on the West Coast of the U.S. you have a current that brings water from E. Siberia, and who knows what the Russians have been up to there. So maybe your clients in Alaska/Washington/Oregon/ California might like to try this experiment. (Also B.C. of course).

All the best,


Hello Aware Electronics,

I am a science teacher in the UK and I've found your site very useful for ideas for experiments.
...
I would like to ask why the daughter products of the radon are called radium b, c and c' when there is no obvious connection with radium.
Thanks

John

Radium A,B,C, etc. terminology is used as an easy method of referring to Radium-Radon daughters, and their position in the decay chain of Radium.

The Radium family includes Radium, Radon (Radium emanation), Radium A (Po 218), Radium B (Pb 214), Radium C (Bi 214), Radium C' (Po 214), Radium C'' (Tl 210), Radium D (Pb 210, Radiolead), Radium E (Bi 210), Radium F (Po 210), Radium G (Pb 206, Lead).


From: Peter Mobberley Peter_Mobberley@compuserve.com
Subject: grampound
To: Aware Electronics aware@aw-el.com
hi bryan
thank you for your reply i decided to go for your idea of an additional card to provide COM3 and COM4 the rm-60 is thus accommodated our trip to grampound road cornwall was very successful and intuative--------------background here in the uk is 11 to 14 cpm say 12.5 on arrival at grampound cpm in our cherokee was 120 just 10 times background !!!!!

outside on the spoil heaps we got readings from 500-1500 cpm in particular minerals showing a green tinge were the most active on our return home i leached these green samples conc nitric acid and concluded that copper was the green compound [ the radioactive part remaining with the mineral on the filter paper] when selling your product i think it would be an advantage to provide a radioactive substance for investigation both the us and uk and others forbid the proliferation of radioactive materials--------------unless they are naturally occurring would you be interested in purchasing such mineralogical specimens which are natural and therefore mailable ??
73"pete


Subject: geiger counter monitoring experiment
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Hi,

Just wanted to let you know I added a page to my web site showing some results from just running the RM-60 counter for four months in my apartment. I was able to measure radon from the gas used in my room heater (well, I think anyway).
http://shell3.ba.best.com/~beale/measure/index.html
-john beale@best.com


From: hrbj
X-Mailer: Mozilla 4.0 [en] (Win95; I)
To: aware@aw-el.com
Subject: Radon in Caves

I have just returned from a visit to Derbyshire, UK, whith an RM80. There are a number of tourist caves there, in mainly limestone country, and some other caves which are open access. I was surprised to find quite considerable activity in one of the latter, especially where water runs in cracks down the cave side. Near the tourist cave entrance is a teashop, and I noticed a small ventilation unit built into the hillside next to it. This presumably was part of the ventilation system for the tourist caves. When holding the RM80 next to the fans, a large increase in count rate was noted, maybe 20 or more times background, but as I did not have my laptop with me, measurement was not possible. I certainly wouldn't want to spend too much time in the caves, as miners have done for a couple of hundred years at this site!


X-Mailer: Mozilla 3.01 (Win16; I)
MIME-Version: 1.0
To: aware@aw-el.com
Subject: AW-SRAD Version 2.0
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit

Dear Sirs:
I have had one of your RM-60 monitors for several years now. I have used it on several occasions, my son used it for a couple of science fair projects, and I had a heart test the other day which involved being injected with radioactive thallium and I dug it out again to measure how much residual radiation I was emitting- (a lot it turns out, after 24 hrs 5600 MiP/hr). At 3 feet away from the monitor, I was emitting around 400 MiP/hr.

Was curious and pleased to find you on the internet to see if the software had been updated in the past few years. Could you furnish an update if it has?

Overall, I wanted you to know that I consider your product outstanding and among the best device I've ever obtained in 25 years of working with computers. It has always been reliable, easy-to-use, and does what it was intended for in an excellent manner. I wish you much continued success.


I already personally own quite a lot of Aware Electronics Corp. radiation monitoring equipment and think it is absolutely first-rate -- and so do my students.

Richard L. Hoffmann, Ph.D..
Emeritus Professor of Chemistry
Illinois Central College
One College Drive
East Peoria, IL 61635


At 04:59 PM 11/7/96 -0500, you wrote:
>Dear Sir or Madame:
> A friend of mine who is in high school needs a definition for what
>is a gamma counter. I believe she means an instrument that is able to count
>gamma radiation from gamma emitters. Can you please e-mail a simple
>definition of what this machine is, and what it is capable of doing?
>
>Thank You,
>
A gamma counter can be thought of as a photon detector-resolver. A gamma counter causes the quantum photon wave to resolve in such a way that it can be detected. The act of detection causes the quantum photon to resolve.

Gamma photons are very powerful, some so powerful they contain enough energy to resolve into electrons.

Think about that. It's amazing to wonder the process which brings about cosmic rays! Is this with which star ships are powered?


This is Dave Padalino from the University of Buffalo. I just ordered an RM-60 unit from you a week ago, and it is working great. There have always been some concerns about the radon levels in basements around the area of Liverpool where I permanently reside, and I have wondered what the exact level of radiation was in my basement just in case. It put my mind at ease when I found out that it was an average of 12.3 micro Roentgens per minute when I tested it. A few years back someone I knew had unusually high levels of Radon in their basement, so it's a help to be able to visualize the levels of radiation with your graphing program AW-srad. Thanks again for a fine product.
Email aware@aw-el.com

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