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*To*: radsafe@romulus.ehs.uiuc.edu*Subject*: Re: Minimum Detectable Activity*From*: Rahim Ghanooni <rahim@inav.net>*Date*: Fri, 23 Aug 1996 13:00:49 -0500

Horacio: You can refere to NCRP 58, and ANSI N13.30 for derivation, also if you can get a copy of NBS SP456, "the minimum detectable activity concept" would be very usefull. If you need a copy let me know. At 02:45 PM 8/22/96 -0500, you wrote: >Hello fellow RADSEFERS, > >I came across an equation for calculating MDA based on statistical >analysis that states MDA = (4.65 x N^0.5 + 3) / ET where N is the number >of counts for the background in time T and E is the sensitivity of the >detector in cps/unit activity. Our specific problem regards leak testing >of selaed sources and this equation is suggested by the AECB (CANADA). > >I understand how the MDA is based on a given confidence level assuming >Poisson statistics but cant seem to see (or find) a good derivation of >this equation. Cember (1996) presents this equation without a thorough >derivation. > >Please let me know if there is a better reference. > > >Horacio J. Patrocinio >Hotel-Dieu de Montreal Hospital >Montreal, Canada > > Mr. Rahim Ghanooni Sr. Health Physicist Certified Hazardous Material Manager (CHMM) 319-851-7133 rahim@inav.net My opinion only.

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