基于LaBr_3:Ce探测器的^(241)Am-Be中子源测井研究  

Research on neutron-gamma logging with an ^(241)Am-Be source based on LaBr_3:Ce detector

作　　者：万文杰[1] 周伟[1] 周建斌[1] 赵祥[1] 喻杰[1] 何绪新 罗翔 秦泓江 向丘林 

机构地区：[1]成都理工大学核技术与自动化工程学院,成都610059 [2]中国石油测井集团有限公司,西安710032 [3]中核建中核燃料元件有限公司,宜宾644000

出　　处：《核技术》2017年第11期45-49,共5页Nuclear Techniques

基　　金：国家自然科学基金(No.11675028);国家重点研发计划重点专项(No.2016YFC1402505);科技苗子工程(No.2016099)资助~~

摘　　要：针对国内中子测井所使用探测器探测效率不能满足实际应用的情况,采用^(241)Am-Be中子源和LaBr_3:Ce探测器在中石油公司一个放射性同位素中子测试井中对H、C、Fe等几种地壳元素进行了测量,并与现今测井常用的锗酸铋(Bismuth Germanium Oxide,BGO)探测器进行对比测量。测得的能谱结果对比发现,进行地壳元素测量时LaBr_3:Ce探测器比BGO探测器具有更高的能量分辨率,并且在相同外部测试条件下BGO探测器探测到Fe峰非常微弱。因此将LaBr_3:Ce探测器进一步应用到测井中的市场前景广阔。Background： The widely used bismuth germanium oxide （BGO） detector has low energy resolution in neutron well logging, and thus cannot meet the requirements of some practical applications. Purpose： This study aims to obtain high energy resolution spectrum using a LaBr3：Ce detector in neutron-gamma logging. Methods： Several common geochemical elements such as H, C and Fe were measured using 241Am-Be neutron source with LaBr3：Ce detector in a radioisotope neutron testing well belonging to China Petroleum Group Logging Corporation, and a commonly used BGO detector was employed to provide a comparison with LaBr3：Ce detector under the same well logging test condition. Results： The energy spectrum of LaBr3：Ce detector exhibited higher energy resolution than that of BGO detector, and a clear signal of Fe whilst a very weak Fe signal in energy spectrum of LaBr3：Ce detector. Conclusion： The application of LaBr3：Ce detector in nuclear logging has a promising prospect.

关 键 词：241Am-Be中子源 LA Br3:Ce探测器 能量分辨率 测井 

分 类 号：TL812[核科学技术—核技术及应用]