ISO 16659系列提供了不同的测试方法，旨在评估核设施通风系统中放射性碘捕集器的性能。本系列涉及带有固体吸附剂的碘捕集器，主要是活性和浸渍木炭，核设施通风系统中最常见的固体吸附剂，以及用于特殊条件的其他吸附剂（例如高温沸石）。ISO 16659-1提供了适用于该系列所有方法的一般要求。 本文件的范围是提供使用环己烷（C6H12）作为示踪剂测定碘阱机械泄漏率的试验方法的一般和通用要求。这种可重复的方法可以支持核运营商将结果与安全报告中给出的参考值进行比较。与ISO 16659-2中描述的放射性甲基碘方法不同，本文所涵盖的环己烷现场测试方法不直接给出碘阱的去污因子，而仅给出完整性测试的碘阱性能信息。 由于在现场试验中使用了低毒的环保试验试剂，该方法主要适用于那些可居住空间（如核电站主控室）的通风系统，以及单个碘阱在交付验收前的性能试验。此外，该方法还可用于带有活性炭取样罐的碘捕集器（如III型深床碘捕集器和II型抽屉式碘捕集器）。

ISO 16659 series provide different test methods aiming at assessing the performances of radioactive iodine traps in ventilation systems of nuclear facilities. This series deals with iodine traps with solid sorbent, mainly activated and impregnated charcoal, the most common solid sorbents used in ventilation systems of nuclear facilities, as well as other sorbents for special conditions (e.g. high temperature zeolites). ISO 16659-1 provides the general requirements to be applied for all methods of the series.

The scope of this document is to provide general and generic requirements for the test method using cyclohexane (C6H12) as a tracer to determine the mechanical leakage rate of iodine trap. This reproducible method can support nuclear operators to compare the result with reference values given in safety reports.

Unlike the method of radioactive methyl iodide described in ISO 16659-2, the cyclohexane field test method covered in this document does not directly give a decontamination factor for the iodine trap, but only the iodine trap performance information of an integrity test.

Due to the use of the environmentally friendly test reagent of low-toxicity in the field tests, the method is mainly suitable for ventilation systems of those habitable spaces (e.g. main control rooms of nuclear power plants), and performance test of a single iodine trap before its delivery and acceptance. In addition, the method can also be used for iodine traps with activated carbon sampling canister (e.g. deep bed iodine trap Type III and Drawer iodine trap Type II).