Method of γ-peak removal in coincidence measurement system for verification of nuclear arms control

The paper analyzes the influence of γ-rays on coincidence measurement system performance according to the principle of coincidence measurement in verification technology of nuclear arms control, and proposes the refusing window method to remove γ-peak. Experiments show that this method can significantly reduce the γ-peak, and the removal rate of γ-rays reaches 99%. Thus the refusing window method improves the precision of coincidence measurement system.