CAJ | 학술논문

微型中子源反应堆（简称微堆）是以高浓铀（235 U ）作燃料的轻水欠慢化型反应堆，辐照孔道内存在有较大份额的超热中子和快中子，适合进行超热中子活化分析（ENAA）的实验研究。地质样品成分复杂，在用普通的中子活化分析时，基体元素影响了部分元素的准确测定。为降低基体成分的本底干扰、改善目标元素的测量精密度和检出限，可采用超热中子活化分析的方法。本文利用微堆上安装的屏蔽材料为镉的超热中子辐照孔道，测定了元素周期表中67种元素的约130个核素的镉比，讨论了在超热中子活化分析中某些元素的有利因子及铀裂变和（n ，p）反应的干扰情况，验证了微堆ENAA方法在地质科学样品检测中的实际应用，证实利用本方法可测定地学样品中20余种元素，其检出限、精密度和准确度均得到了较明显的改善。该法是常规活化分析方法必要的、有益的补充。
미형중자원반응퇴（간칭미퇴）시이고농유（235 U ）작연료적경수흠만화형반응퇴，복조공도내존재유교대빈액적초열중자화쾌중자，괄합진행초열중자활화분석（ENAA）적실험연구。지질양품성분복잡，재용보통적중자활화분석시，기체원소영향료부분원소적준학측정。위강저기체성분적본저간우、개선목표원소적측량정밀도화검출한，가채용초열중자활화분석적방법。본문이용미퇴상안장적병폐재료위력적초열중자복조공도，측정료원소주기표중67충원소적약130개핵소적력비，토론료재초열중자활화분석중모사원소적유리인자급유렬변화（n ，p）반응적간우정황，험증료미퇴ENAA방법재지질과학양품검측중적실제응용，증실이용본방법가측정지학양품중20여충원소，기검출한、정밀도화준학도균득도료교명현적개선。해법시상규활화분석방법필요적、유익적보충。
The miniature neutron source reactor (MNSR) is based on highly enriched uranium (235 U ) as fuel and light water as moderator .Because of a larger share of epithermal neutron and fast neutron in irradiation channel ,the reactor is suitable for epithermal neutron activation analysis (ENAA ) .In general neutron activation analysis the main component elements in complex geological samples such as aluminum ,sodium , iron and so on affect the determination accuracy of some target elements .In order to reduce the interference of the background of main component elements and improve the precision and detection limit of the target element ,the ENAA can be used in the test of geological samples .By using epithermal neutron irradiation channel made of cadmium , the Cd ratios of about 130 nuclides of 67 elements in the periodic table were measured . T he advantage factors of some elements and the interferences of uranium fission and (n , p) reaction in ENAA were discussed .The practical application of MNSR ENAA method in testing of geological sample was verified .The results show that more than 20 kinds of elements can be ascertained in the sample measuring by this method . The detection limit ,precision and accuracy are more significantly improved .The MNSR ENAA is a necessary and beneficial supplement of the conventional activation analysis method .