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Old 05-25-2019, 05:22 PM
elsapo elsapo is offline
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Default ADM-300 Radiac best bang for the buck radiation detector



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Has a big dynamic range from background to 10000R instant death readings.

You can get these on ebay for less than 300 dollars.

The units are sealed and can be washed down for decon
Can measure beta contamination with the built in probe when beta shield is flipped open.

It functions as a dosimeter and ratemeter simultaneously and alarms can be set for both.

One of the nicest features I have not seen on many devices is the ability to keep the gamma rate meter and dosimeter going while you use an external probe like the pancake probe.

It will also subtract from the background gamma the counts so that you can use the beta probe in a high gamma ambient environment and not miss contaminated items as you pass the pancake probe over things.


Rugged and also EMP hardened as well.

So far out of all the different Radiological detection tools I have tested the ADM300 offers the most well rounded and easiest to use turnkey package to keep ready in the event of any incident.

I will be testing more and report on interesting findings.

The units also have built in testing, the probes are smart and calibration data and high voltage supply is built into the probes as well.
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Old 05-25-2019, 05:31 PM
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CONELRAD CONELRAD is offline
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For those interested:
Evaluation of Nuclear Research Corporation's ADM-300 Radiation Detection, Indication, and Computation (RADIAC) Instrument

https://apps.dtic.mil/dtic/tr/fulltext/u2/a260233.pdf

The eval was mostly positive, a few minor issues were noted which may have been corrected in later revisions.
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Old 06-07-2019, 08:46 PM
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So far the ADM-300A is turning out to be a great general purpose instrument. Flat response and comparable to my 451P-RYR in mixed fields. It responds quickly to sudden elevations in gamma activity.

What makes no sense is why is the Airforce surplussing perfectly good instruments. One case was brand new never issued, and others just look like they were opened for function verification, calibration and then closed back up again.

Is the Airforce switching to a new model?

So many state and local agencies still struggle with obsolete CD you would think they would just be handed down these nice survey meters instead.

That pdf is interesting I would not be surprised if changes made after that report.

Having a CDV-700,CDV-715 and dosimeter in a EMP hardened package with continuous BITE is nice to have around.

BITE is built in self test. Common with military equipment. The ADM-300s are always self testing even during use, it takes a few CPU cycles to validate system components during operation
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Old 06-13-2019, 05:23 PM
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Okay practically new ADM-300s being dumped is due to a change in hardware.

#1 AA battery operation (4) vs 2 9v battery
#2 simulation mode for training purposes
#3 usb compatibility with converter cable change.

So thats the mystery of why practically new units dumped on the market. Further testing shows a nice flat energy response similar to a Fluke 451P.
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Old 06-14-2019, 10:04 AM
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Quote:
Originally Posted by elsapo View Post
Okay practically new ADM-300s being dumped is due to a change in hardware.

#1 AA battery operation (4) vs 2 9v battery
#2 simulation mode for training purposes
#3 usb compatibility with converter cable change.

So thats the mystery of why practically new units dumped on the market. Further testing shows a nice flat energy response similar to a Fluke 451P.
Where?
PM me if you don't want to put the source out in the open.
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Old 07-06-2019, 01:51 PM
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Thanks for the info, I have been thinking about getting one for awhile. Picked one up on eBay under $300. Looks brand new.
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Old 07-09-2019, 06:32 PM
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Quote:
Originally Posted by Metalbird View Post
Thanks for the info, I have been thinking about getting one for awhile. Picked one up on eBay under $300. Looks brand new.
If you ever get a 10uCi cs-137 source the unit should read 6.5mR/hr (+- 15%)
These units are very accurate and you can take 5 of them and they would all measure within 10% of each other or better. Place the check source label facing up on the L marking on the bottom of the unit.

Tip regarding alarms. If you turn the unit on but not activate audio, the only time you will hear sound is during a dose or dose rate alarm. This is useful if you do not want to be disturbed by the clicks but only alerted on a condition.

The increment button (one marked with up arrow silences the alarm)

BTW the pocket on the side of the pouch is to put a spare set of 9v batteries when carrying in the field I highly recommend carrying it in the pouch. Also 9v lithiums are even better than alkaline for longer 24/7 operation etc.
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Old 07-09-2019, 07:10 PM
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In our shelter we have 3 units along with pen dosimeters and charger. Right now the ADM-300 is our standard model and everyone knows to operate it, and as you note the buttons are designed to work nicely even with MOPP gear when you are all thumbs due to the gloves.
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