[ RadSafe ] doses below 7,5mySv

[blreider at aol.com]

Marco, 

If you have a lot of experience in this area, please excuse me for stating the obvious.  You have not really given enough information to assess the situation.  Any good dose program requires a technical basis for making decisions.  The technical basis should include factors such as dose limits, background and other interferences, missed dose (statistical sensitivities), frequency of the monitoring & expected and known statistical variability and process bias.  The processes used should regularly be tested using a quality assurance program.  

The US NRC provides regulatory guides for developing dose evaluation programs among other things:

http://www.nrc.gov/reading-rm/doc-collections/reg-guides/occupational-health/active/

Years ago in the US it was common practice to round negative dose up to zero; this practice has been dropped in favor of using actual data (unbiased results).   If you have data, use your data.  If your results are always reported as <MDA or some other statistical value, consider the "missed dose" and if too large with respect to reporting limits, the possibility of changing methods of detection and reporting.  

Hope this helps.

Barbara Reider, CHP


-----Original Message-----
From: marco bähler <m.c.baehler at bluewin.ch>
To: radsafe at radlab.nl
Sent: Thu, Jul 16, 2009 8:00 am
Subject: [ RadSafe ] doses below 7,5mySv


I `d like to know more about rounding to zero the doses below 7,5 mySv. history of this method, pros and cons ? 
aprecciate your c
ontribution 
marco 
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