A Radiation Protection and Field Survey of a Fast Neutron Whole-Body Activation Analysis Facility

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Abstract
A radiation protection and field survey employing activation foils, rem counters and a transportable laboratory type TEPC and data analysis system has been carried out at a medical d+T fast neutron activation analysis facility. Included in the survey were TEPC measurements of dose equivalent rates in and out of the collimated beam, which were found to be of the order of 4 mSv.h-1 with a 2% gamma fraction and 1 to 8 µSv.h-1 with around 25% gamma fraction respectively. Both the activation foil and microdosimetric measurements confirm that the beam is close to 14 MeV in energy although there is a significant lower energy component to the beam. Comparative measurements made along the central axis of the beam with a Studsvik rem counter and the TEPC showed that both systems have a similar response to the scattered component of the radiation field and that due to the collimination arrangement the room scatter is very low.

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