Abstract
A quick method utilizing the 19F(n, α) 16N reaction for detecting fast neutron contamination in photon beams is described. A teflon (CF 2) n target is used and the 6.131 MeV γ line following the β-decay of 16N is detected usibg Ge(Li) detector. The advantages of the present method compared with other methods utilizing fast neutron activation such as 27Al(n, α) 24Na or inelastic neutron scattering such as 12C(n, n′γ) 12C reaction are discussed.
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