巴基斯坦波特兰水泥中的天然伽马发射放射性核素。

Natural gamma-emiting radionuclides in Pakistani Portland cement.

作者信息

Khan K, Khan H M

机构信息

Radiation Chemistry Laboratory, National Centre of Exellence in Physical Chemistry, University of Peshawar, Pakistan.

出版信息

Appl Radiat Isot. 2001 May;54(5):861-5. doi: 10.1016/s0969-8043(00)00327-4.

DOI:10.1016/s0969-8043(00)00327-4

PMID:11258538

Abstract

Studies of the natural gamma-emitting radionuclides in Portland cement manufactured in the North West Frontier Province (NWFP) of Pakistan and the various raw materials which compose the product have been carried out using gamma-spectrometric techniques. For data acquisition a high-purity germanium detector (HPGe) was used. The range of the total specific activity (minimum and maximum values) due to all the three radionuclides (40K, 226Ra and 232Th) were found to be 187.8+/-63.5-573.2+/-73.1 Bq kg(-1) (Portland cement); 54.5+/-16.1-183.9+/-31.4 Bq kg(-1) (limestone); 87.1+/-30.7-297.1+/-64.4 Bq kg(-1) (gypsum); 696.4+/-79.1-1043.9+/-85.0 Bq kg(-1) (slate); and 490.9+/-54.5-570.2+/-59.8 Bq kg(-1) (latrite). The average specific activities due to 40K in Portland cement and all the raw materials were found to be higher when compared with 226Ra and 232Th. Such materials do not pose any excess radiological health problem.

摘要

利用伽马能谱技术研究了巴基斯坦西北边境省（NWFP）生产的波特兰水泥中天然发射伽马射线的放射性核素以及构成该产品的各种原材料。为了进行数据采集，使用了高纯度锗探测器（HPGe）。发现所有三种放射性核素（40K、226Ra和232Th）导致的总比活度范围（最小值和最大值）为187.8±63.5 - 573.2±73.1 Bq kg(-1)（波特兰水泥）；54.5±16.1 - 183.9±31.4 Bq kg(-1)（石灰石）；87.1±30.7 - 297.1±64.4 Bq kg(-1)（石膏）；696.4±79.1 - 1043.9±85.0 Bq kg(-1)（板岩）；以及490.9±54.5 - 570.2±59.8 Bq kg(-1)（红土）。与226Ra和232Th相比，发现波特兰水泥和所有原材料中40K导致的平均比活度更高。此类材料不会造成任何额外的放射健康问题。