CAJ | 학술논문

脉冲快热中子分析（ PFTNA）是一种先进的可对块状物品进行成份分析的无损检测技术，它在探雷中扮演着最终决策的重要角色，但对N元素的探测速度过慢一直是该技术的短板。在PFTNA探雷实验中，为了提升对可疑目标物中N元素的探测速度，采用MCNP5程序为脉冲D-T中子发生器设计了全新的石墨慢化体。模拟计算结果表明，该石墨慢化体的引入可以有效提高脉冲滞空内目标物中慢、热中子注量，从而较大程度地提升对N元素的探测速度。开展了该慢化体慢化效能的验证实验，实验结果与理论计算符合良好，表明中子源石墨慢化体的引入，能明显提升PFTNA探雷系统对N元素的探测速度。
맥충쾌열중자분석（ PFTNA）시일충선진적가대괴상물품진행성빈분석적무손검측기술，타재탐뢰중분연착최종결책적중요각색，단대N원소적탐측속도과만일직시해기술적단판。재PFTNA탐뢰실험중，위료제승대가의목표물중N원소적탐측속도，채용MCNP5정서위맥충D-T중자발생기설계료전신적석묵만화체。모의계산결과표명，해석묵만화체적인입가이유효제고맥충체공내목표물중만、열중자주량，종이교대정도지제승대N원소적탐측속도。개전료해만화체만화효능적험증실험，실험결과여이론계산부합량호，표명중자원석묵만화체적인입，능명현제승PFTNA탐뢰계통대N원소적탐측속도。
Pulsed fast/thermal neutron analysis ( PFTNA) is an advanced bulk technique for non -destructive elemental characterization , which plays an important role of confirmation sensor in demining activities , but it has a drawback in the detection speed of nitrogen .For improving the detection speed of nitrogen in the object under interrogation in PFTNA landmine identification experiment , a brand new graphite moderator designed u-sing Mont-Carlo method was introduced to the pulsed D -T neutron generator .The simulation results indica-ted that the adoption of the moderator can largely increase the thermal -neutron flux between pulses , and then increase the detection speed of nitrogen .The theoretical enhancements brought by the moderator was validated by relevant experiment , and the verification data tallied well with the simulation result , which demonstrated the adoption of graphite moderator can largely improve the detection speed of nitrogen in PFTNA countermine exper -iment .