Absrtact: High-current linear induction accelerator produces a large number of photoneutrons and electrons along with pulsed X-rays, which will affect the quality of flash photography. In this paper, an estimation model of X-rays produced by the interaction of high current electron beam with solid target is established by using MCNP5. The distribution of photons, neutrons and electrons in a 1mm tantalum target bombarded by an electron beam with beam intensity of 2kA, electron energy of 18MeV, pulse width of 100ns and Gaussian FWHM of 1.5 mm is simulated. The results are verified by thermoluminescence dosimeter. The distribution of photons, neutrons and electrons in the space angle of 0 ~ 10 ° (key diagnostic region) directly in front of the target region is studied by using this computational model. The calculated results show that the average photon energy is about 3MeV and the number of photons is about 10¹⁵, accounting for 58% of the total number of photons in the space angle of 0 ~ 10 in front of the target. In the same region, the number of electrons is about one quarter of the number of photons, and the average energy is about 13MeV. The average energy of neutrons is about 1MeV, and the number of neutrons is about 5×10⁹, accounting for only 5.5% of the total number of neutrons. The results show that in the range of 0 ~ 10 degrees, the number of electrons and photons is in the same order of magnitude, while the number of neutrons is 5 orders of magnitude lower than that of photons, but neutrons have strong penetrability in the high Z environment of diagnosis area. Therefore, in order to obtain better flash photography effect, it is necessary to take shielding measures for electrons and neutrons in the diagnosis area.
 

High current linear induction accelerator,MCNP5,Radiation field