锰矿石中总α和总β放射性活度测定方法研究  

Determination Method for TotalαandβRadioactivity in Manganese Ore

作　　者：荣文娜 王安丽 蔡伟亭 李贝 张明慧 宋君鹏 RONG Wenna;WANG Anli;CAI Weiting;LI Bei;ZHANG Minghui;SONG Junpeng(Tianjin Baogang Research Institute of Rare Earths Co.,Ltd.,Tianjin 300300,China)

机构地区：[1]天津包钢稀土研究院有限责任公司,天津300300

出　　处：《中国锰业》2025年第1期88-91,共4页China Manganese Industry

摘　　要：锰矿石作为重要的战略资源,其放射性活度的准确测定对环境保护和人体健康具有重要意义。为建立一种便捷、快速的锰矿石放射性分析方法,补充现有检测手段,并为制定相关检测标准提供参考。通过结合水样厚源法和稀土矿放射性检测方法,优化了锰矿石中总α和总β放射性活度的测定流程。实验探讨了最小称样量、检测时间、仪器本底及串道影响等因素,确定了最佳检测条件。结果表明,锰矿石的最小称样量为150 mg,检测时间需达到90 min以确保计数稳定。仪器本底测量显示,α本底波动较大,而β本底较为稳定;串道影响分析表明,α射线对β道的串道比为4.06%,而β射线对α道的影响可忽略不计。方法的精密度较高,总α和总β放射性活度浓度的相对标准偏差分别为0.25%和0.11%。该方法适用于低放射性样品的测定,为锰矿石放射性检测提供了可靠的技术支持。As an important strategic resource,accurate determination of radioactivity in manganese ores is crucial for environmental protection and human health.This study established a convenient and rapid analytical method for radioactivity determination in manganese ores by combining the thick-source method for water samples with rare earth ore radioactivity detection techniques,aiming to supplement existing detection methods and provide references for formulating relevant detection standards.Key factors including minimum sample weight,detection duration,instrument background,and channel crosstalk were systematically investigated to optimize the detection protocol.The results demonstrate that 150 mg is the minimum sample weight required,with a 90 min detection duration ensuring stable counting.Background measurements showed significant fluctuations inαbackground but stableβbackground.Crosstalk analysis revealed 4.06%α-to-βchannel interference whileβ-to-αinterference was negligible.The method exhibits high precision with relative standard deviations of 0.25%and 0.11%for totalαandβradioactivity concentrations,respectively.This reliable technique is particularly suitable for low-radioactivity samples,providing robust technical support for manganese ore radioactivity detection.

关 键 词：锰矿石 总α放射性、总β放射性 放射性活度 低本底测量 

分 类 号：O657.4[理学—分析化学]