Target design for gamma-ray production of proton accelerator based mine detector

Mines used for military purposes during war-time can do harms to civilians after wars. Actually it is often reported that civilians become dead or injured due to accidents related to mines. Therefore mine detectors such as a metal detector is used to detect and remove mines, but its detecting efficiency and safety do not reach the level of satisfaction. KAERI(Korea Atomic Energy Research Institute) has been developing a more effective mine detect or which adopts the nuclear resonance reaction between 9.17MeV gamma-ray and N14 included commonly in various kinds of explosives such as mines. 9.17MeV gammas can be produced by bombarding 1.75MeV protons to C13 nucleus. Those gamma-rays are produced with the angle of 80.7 .deg. C to the proton beam direction. Therefore a 1.75MeV proton accelerator and a C13 target are needed. A 10mA accelerator is being designed to produce intense 9.17MeV gamma-rays, so intense heat is deposited in the target. In this paper, we discuss the results of cooling and thermal stress calculations for the target, and materials and design parameters of target systems which produce effective 9.17MeV gamma-rays and suppress background gamma-rays