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[en] A method of determining the specific activity of sup(115m)In in indium foils for fast neutron determination after a criticality incident is described. Two Ge(Li) gamma-ray spectrometers were calibrated with standards traceable to the National Physical Laboratory. The importance of using a long term check source and of careful positioning of sources is stressed and a method of calculating the optimum time for counting in the presence of a shorter lived interference is given. (author)
Source
Jul 1978; 15 p; ISBN 0 70 580429 1; 
; Also available from H.M. Stationery Office, price Pound1.00
; Also available from H.M. Stationery Office, price Pound1.00