Abstract
A method of calibrating the efficiency of a high-energy neutron detector is described. Results are given for a plastic scintillator block, in the region 21–29 MeV. Comparison with results from other laboratories shows that, with a proton energy detection threshold of about 4 MeV, and for linear dimensions not too much smaller than the range of the maximum energy protons, the efficiency is rather independent of the size or shape of the scintillator and equal to nearly 2% per centimetre thickness in the range 10–30 MeV.
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