Prompt gamma-ray spectra measurement of typical sample in explosive detection

In research of explosive detection by neutron probe, the gamma rays was produced by 14 MeV neutron bombardment on the sample nucleus with atom numbers bigger than 5. The gamma spectra of typical elements, such as C, N, O and simulated explosive, were measured by associated particle technique (APT) and time of flight (TOF). The large NaI(Tl) detector with the dimension of 12.5 cm20 cm was used. The measured gamma spectra were compared with those of European Union (EU). The results show that both of the experiments were at the same level.