Linsley G S
Phys Med Biol. 1977 Jan;22(1):64-9. doi: 10.1088/0031-9155/22/1/008.
The results of leakage tests on approximately 2000 clinical radium sources in current use in several hospitals are presented. The tests were carried out using a liquid scintillation immersion method. Less than 1% of the sources leaked radon gas (222Rn) to an extent greater than 1 nCi/24 h. The consequences of a small leakage of radon from a source while implanted in tissue are considered and compared with the hazards and problems created when sources leak during storage. A leakage rate of 1 nCi/24 h is suggested as an appropriate limit beyond which sources should be removed from use.
本文展示了对几家医院目前正在使用的约2000个临床镭源进行泄漏测试的结果。测试采用液体闪烁浸没法进行。泄漏氡气（222Rn）量超过1 nCi/24小时的源不到1%。文中考虑了源植入组织时少量氡泄漏的后果，并与源在储存期间泄漏所产生的危害和问题进行了比较。建议将1 nCi/24小时的泄漏率作为一个合适的限值，超过此限值的源应停止使用。
