论文部分内容阅读
一、前言镭源辐射γ射线在空气中一定距离处产生照射量率是剂量学中一个重要数据,常用它标定各种剂量仪表。从三十年代至六十年代许多作者对此数据进行了测量,随着测量技术的飞跃发展,测量精度有很大的提高。镭源具有很长的寿命又有精确的剂量常数,但镭源必须完全密封,稍有不慎,即泄漏氡气造成环境污染影响准确度,且价格昂贵。钴-60是一种人工放射性同位素,价格低廉寿命较长。是一种应用很广的放射性同
I. Introduction Radiation source gamma rays in the air at a certain distance from the radiation dose rate is an important data in dosimetry, it is commonly used to calibrate a variety of dose meters. This data has been measured by many authors from the 1930s to the 1960s, and with the rapid development of measurement technology, measurement accuracy has been greatly improved. Radium source has a long life expectancy and accurate dose constants, but radium source must be completely sealed, a little careless, that is, the impact of environmental pollution caused by leakage of radon accuracy, and expensive. Cobalt-60 is an artificial radioisotope with low price and long life. Is a widely used radioactive