个人剂量计滤膜上沉积的238U、234U和230Th的溶解行为。

Dissolution behaviour of 238U, 234U and 230Th deposited on filters from personal dosemeters.

作者信息

Becková Vera, Malátová Irena

机构信息

National Radiation Protection Institute, Bartoskova 28, Prague 4, Czech Republic.

出版信息

Radiat Prot Dosimetry. 2008;129(4):469-72. doi: 10.1093/rpd/ncm455. Epub 2007 Nov 1.

DOI:10.1093/rpd/ncm455

PMID:17974580

Abstract

Kinetics of dissolution of (238)U, (234)U and (230)Th dust deposited on filters from personal alpha dosemeters was studied by means of a 26-d in vitro dissolution test with a serum ultrafiltrate simulant. Dosemeters had been used by miners at the uranium mine 'Dolní Rozínka' at Rozná, Czech Republic. The sampling flow-rate as declared by the producer is 4 l h(-1) and the sampling period is typically 1 month. Studied filters contained 125 +/- 6 mBq (238)U in equilibrium with (234)U and (230)Th; no (232)Th series nuclides were found. Half-time of rapid dissolution of 1.4 d for (238)U and (234)U and slow dissolution half-times of 173 and 116 d were found for (238)U and (234)U, respectively. No detectable dissolution of (230)Th was found.

摘要

通过使用血清超滤模拟物进行26天的体外溶解试验，研究了沉积在个人阿尔法剂量计滤膜上的（238）U、（234）U和（230）Th粉尘的溶解动力学。剂量计由捷克共和国罗兹纳的“Dolní Rozínka”铀矿的矿工使用。生产商宣称的采样流速为4 l h⁻¹，采样周期通常为1个月。研究的滤膜含有125±6 mBq的（238）U，与（234）U和（230）Th处于平衡状态；未发现（232）Th系列核素。（238）U和（234）U的快速溶解半衰期为1.4天，（238）U和（234）U的缓慢溶解半衰期分别为173天和116天。未发现（230）Th有可检测到的溶解。