Abstract
An orientation independent dosemeter is reported here using a CaSO4:Tm phosphor powder recently developed in Japan (Yamashita, Nada, Onishi and Kitamura 1968). This phosphor combines very high sensitivity with a small intrinsic response to fast or thermal neutrons. Instead of using encapsulating walls of hydrogeneous substances to supply protons to react with the solid phosphor, the powdered phosphor has been mixed with a hydrogeneous powder (e.g. glucose crystals) in order to eliminate the angular dependence of response.