期刊论文

Analytical method for ~(14)C in urine

Chen, F.

中文

中华放射医学与防护杂志

0254-5098

2021

41

11

843-846

10.3760/cma.j.issn.0254-5098.2021.11.008

International Collaborative Research supported by Environmental Radioactivity Research Network Center I-21-18; Key Program of Tianjin Municipal Natural Science Foundation 19JCZDJC40500

本校为第一机构

目的为了完善放射性核素14C的监测方法, 估算14C对人体造成的内照射剂量, 保护14C暴露行业职工和公众的身体健康。方法用湿法氧化法对尿样进行前处理。分析时用过硫酸钾作为氧化剂把尿素氧化分解为二氧化碳, 并用1 mol/L氢氧化钠吸收后, 使吸收液转化为碳酸钙沉淀, 碳酸钙粉末悬浮法制样, 低本底液体闪烁计数仪检测计数并计算分析结果。结果用尿素作为载体优化后的反应时间为1 h, 对于80 ml尿样, 过硫酸钾的使用量为10 g, 方法回收率可达到97.15% ～ 102.09%, 测量时间300 min时, 方法检测下限为0.22 Bq/L。实际检测的4个尿样中, 14C活度浓度分别为0.32、0.60、0.86和0.74 Bq/L。结论优化后的方...

Objective: To improve the analytical method of radionuclide 14C, and estimate the internal dose caused by 14C to human, in order to protect the health of workers and the public in workplaces involving potential 14C exposure. Methods: Urine samples were pretreated by wet oxidation. In the analysis, potassium persulfate was used as an oxidant to decompose urea into carbon dioxide, which was absorbed by 1 mol/L sodium hydroxide, and the absorption solution was converted into calcium carbonate precipitation. After calcium carbonate powder was prepa...