[ RadSafe ] outdoor low dose rate measurements

Scott Davidson bsdnuke at gmail.com
Wed Apr 3 14:51:02 CDT 2013

Mr. Rich,

If this is converted to microR/h then 30 uR to 130 uR should be noticed on
a scintillation counter like a Ludlum-19 [1" NaI(Tl)].  If the unit's
speaker is on that is a noticeable difference that might not require
looking at the meter.  For the minimum calculated difference it is a little
more difficult but a factor of 2x might need paying more attention to the
sound it makes.

The count rate quoted by Ludlum is 175 cpm per uR/h so it will definitely
make audible sound



On Wed, Apr 3, 2013 at 3:39 PM, <JOHN.RICH at sargentlundy.com> wrote:

> Radsafers
> I just finished a calculation that's going to require a minimally trained
> individual (not a radworker)  to notice the difference between 0.03
> mrad/hr and 0.13 mrad/hr on a handheld meter while walking around an
> outdoor storage area. I'm stressing that this is a calculated result
> because it's the maximum calculated difference. The minimum calculated
> difference is between 0.02 mrad/hr to 0.04 mrad/hr. Actual dose rates
> should fall somewhere in between.
> Is this a reasonable expectation, or is it asking too much of an outdoor
> walk-around with a hand held meter?  BTW, I have no idea what the radon
> conditions are.
> thx in advance  - -jmr
> John Rich
> 312-269-3768
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