§ 173.468 Test for LSA-III material.
发布08-07
生效09-08
摘要总结AI 辅助解读
本条款规定了美国运输部（DOT）针对LSA-III类放射性物质的浸水测试标准。要求代表整个包装内容物的试样在常温水中浸泡7天，且剩余自由水量需满足特定体积比例及水质指标（pH 6-8，电导率≤10 micromho/cm）。测试结束后，自由水中的总放射性活度不得超过0.1 A2。该规定直接影响放射性货物包装合规性验证流程，货主与承运人需确保测试数据符合此阈值以通过申报审核。
- (a) LSA-III Class 7 (radioactive) material must meet the test requirement of paragraph (b) of this section. Any differences between the material to be transported and the test material must be taken into account in determining whether the test requirements have been met.
- (b) Test method. (1) The specimen representing no less than the entire contents of the package must be immersed for 7 days in water at ambient temperature.
- (2) The volume of water to be used in the test must be sufficient to ensure that at the end of the test period the free volume of the unabsorbed and unreacted water remaining will be at least 10% of the volume of the specimen itself.
- (3) The water must have an initial pH of 6-8 and a maximum conductivity of 10 micromho/cm at 20 °C (68 °F).
- (4) The total activity of the free volume of water must be measured following the 7 day immersion test and must not exceed 0.1 A 2 .