Laidlaw James, Dix Roland, Slack Philip, Foy Chris, Hayward Andy, Metherall Alan, Ireland Steve, Wright James, O'Rourke Paul, Williams Jon, Rose Anneka
1 3551 2gether NHS Foundation Trust , UK.
2 Gloucestershire Research Support Service, Gloucestershire Royal Hospital, UK.
Med Sci Law. 2017 Oct;57(4):167-174. doi: 10.1177/0025802417725642. Epub 2017 Aug 23.
Weapons and other items with potential to cause harm are usually prohibited in mental-health hospitals and other psychiatric facilities. Detecting such prohibited items (PIs) can be problematic, particularly if concealed, and metal detectors are commonly used to search for such items. Our study compared two types of metal detection: continuous wave detection (CWD) by hand-held metal detector (HHMD) and magnetic anomaly detection (MAD) by a static pole device. In the study, real and dummy PIs were hidden on test subjects and in a simulated body cavity. The results showed MAD to be significantly superior to CWD in detecting small concealed PIs containing ferrous metal. The MAD pole found 100% of the real PIs on the test subjects and in the simulated body cavity. The CWD HHMD found only 5.2% of the real PIs, and these were limited to those on the test subjects, as it detected none in the simulated body cavity. In addition, the time taken to search by MAD pole was shorter than time taken to search by CWD HHMD.
在精神病院和其他精神科设施中，通常禁止使用具有潜在危害的武器和其他物品。检测此类违禁物品（PI）可能会出现问题，尤其是当它们被隐藏起来时，因此金属探测器常被用于搜寻此类物品。我们的研究比较了两种金属检测方式：手持式金属探测器（HHMD）的连续波检测（CWD）和静态磁极装置的磁异常检测（MAD）。在该研究中，真实的和模拟的违禁物品被藏在测试对象身上以及模拟体腔内。结果显示，在检测含有黑色金属的小型隐藏违禁物品方面，磁异常检测明显优于连续波检测。磁异常检测磁极在测试对象身上和模拟体腔内发现了100%的真实违禁物品。连续波检测手持式金属探测器仅发现了5.2%的真实违禁物品，且这些仅限于测试对象身上的，因为它在模拟体腔内未检测到任何违禁物品。此外，磁异常检测磁极进行搜查所需的时间比连续波检测手持式金属探测器所需的时间短。
