【摘要】 针对在线瞬发γ中子活化分析(PGNAA)系统的要求,利用MCNP程序对不同慢化材料(重水、石蜡、聚乙烯等)厚度、铅屏蔽厚度、样品厚度及大小进行模拟计算分析。计算结果表明,以厚9 cm的石蜡作慢化材料,厚2 cm的铅作γ屏蔽层,厚7 cm、半径10 cm的硫、钙和水泥类样品为最优设计方案,从而为实际设计在线PGNAA系统提供了科学依据。更多还原

【Abstract】 An on-line prompt gamma neutron activation analysis(PGNAA) system was designed by using Monte-Carlo simulation for the thickness of different moderator materials(heavy water,paraffin wax,polyethylene,etc.),the thickness of shield lead,and the thickness and size of sample.The calculated results indicate that the optimum dimensions are 50 cm×9 cm for paraffin as moderator material,20 cm×2 cm for lead as gamma radiation shield,and 20 cm×7 cm for S,Ca,and cement samples.These parameters provide references for practical design of the on-line PGNAA system.更多还原