Bismuth-fission detectors for high energy nucleons: II. Proton and neutronresponses

A critical requirement for the Bi-209-fission detector is the knowledge of its response as a function of energy for both neutrons and protons. For thi s reason, stacks of 209Bi-fission detectors have been exposed to proton bea ms of 100 and 150 MeV at the Paul Sherrer Institute. Similar stacks have be en exposed to neutron beams of 100 and 160 MeV at the Svedberg Laboratory f rom Uppsala University. The calibrations data with neutrons have been compa red with those obtained with protons of the same energies. This comparison has proved that the response of Bi-209-fission detector for neutrons is two to three times smaller than that for protons at least in the range of nucl eon energy up to 150 MeV.