采用燃烧法同时定量测定纸盘表面的³H、¹⁴C、³²P、³⁵S、⁵¹Cr和¹²⁵I。

Simultaneous quantitative determination of 3H, 14C, 32P, 35S, 51Cr, and 125I on the surface of a paper disc using combustion.

作者信息

Saito K, Miyatake H, Kobori H, Kurihara N

机构信息

Radioisotope Research Center, Kyoto University, Japan.

出版信息

Health Phys. 1993 Jul;65(1):82-6. doi: 10.1097/00004032-199307000-00009.

DOI:10.1097/00004032-199307000-00009

PMID:8505232

Abstract

A paper disc that retained 3H, 14C, 32P, 35S, 51Cr, and 125I on its surface was combusted in a flow-type combustion flask filled with oxygen. The combustion products containing five radionuclides, except 14CO2, were collected by washing the inner wall of the flask with 0.5-M hydrogen peroxide containing excess NaHSO3. The 14CO2 that remained in the gas phase of the flask was introduced into another flask for absorption into an organic base solution. By determining the radioactivity of both the solutions containing the respective radionuclides by means of NaI(Tl) and liquid scintillation counters, the six radionuclides in the solutions were quantified. The detection limit of surface contamination with this method was compared with the limit specified by Japanese law for the surface contamination of controlled areas.

摘要

一个表面保留有³H、¹⁴C、³²P、³⁵S、⁵¹Cr和¹²⁵I的纸盘在装满氧气的流动式燃烧瓶中燃烧。除¹⁴CO₂外，含有五种放射性核素的燃烧产物通过用含有过量NaHSO₃的0.5M过氧化氢洗涤烧瓶内壁来收集。残留在烧瓶气相中的¹⁴CO₂被引入另一个烧瓶中，以吸收到有机碱溶液中。通过使用NaI(Tl)和液体闪烁计数器测定含有各自放射性核素的溶液的放射性，对溶液中的六种放射性核素进行定量。将该方法表面污染的检测限与日本法律规定的控制区域表面污染限值进行了比较。