[ RadSafe ] rad monitor calibration

[Thompson, Dewey L]

The most common method I've seen is to use a depleted Uranium slab. Due to the energies involved with all of the betas emitted and electronic equilibrium, the surface dose rate is a constant, usually taken at 230 mRem (2.3 mSv)/hr. 

Some facilities use a specific isotope, for example P-32, (and I don't remember the dose rates on that).

The beta factor is simply the known dose rate divided by the open - closed value. 

For a uranium slab with commonly available hand helds (large window), it wi typically be between 3 and 5. Often for field use they will use a standard multiplier of 4. 

Dewey
Sent from my iPhone

> On Jun 1, 2014, at 7:05 AM, "Brent Rogers" <brent.rogers at optusnet.com.au> wrote:
> 
> On a similar vein, does anyone know for certain how the beta-factor on ion chambers is determined?  I'm speaking of obtaining beta dose rates using (open window - closed window) * beta factor.
> 
> Regards
> Brent Rogers
> Sydney Australia
> 
> Sent from my iPad
> 
>> On 1 Jun 2014, at 3:55 pm, ROY HERREN <royherren2005 at yahoo.com> wrote:
>> 
>> 
>> The calibration procedures will vary depending on which specific instrument your calibrating.  Unless you have the in-house expertise, I highly suggest that you leave the instrument calibration to the instrument vendor.  In any case, your instrument vendor should have provided you with an instrument manual when you purchased each of the instruments.  Look through the instrument manual to see if it lists any information about instrument calibration.  Do you own an instrument calibration source?  If so, also look up what the literature from calibration source manufacturer/vendor provides regarding instrument calibration. 
>> 
>> 
>> Roy Herren
>> 
>> 
>> On , ROY HERREN <royherren2005 at yahoo.com> wrote:
>> 
>> 
>> 
>> 
>> Are you specifically referring to the Rad MonitorTM instruments manufactured by Lab Logic, see Rad-Monitors
>> 
>> 
>>  Rad-Monitors  
>> View on www.lablogic.com Preview by Yahoo  
>> 
>> 
>> Roy Herren
>> 
>> 
>> On Friday, May 30, 2014 1:18 PM, "JOHN.RICH at sargentlundy.com" <JOHN.RICH at sargentlundy.com> wrote:
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