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The case of the dodgy bomb detectors

Fake bomb detectors, which gave the user no more chance of detecting explosives than throwing dice, have been sold to security forces throughout the world, mainly in Iraq. As a physicist, Michael Sutherland was asked by police to test and evaluate the device

The ADE-651 in use at a checkpoint in Abu T’Shir, Iraq

The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.

It was claimed that the ADE-651 bomb detector emitted electromagnetic waves. The analysis in this article considers the energy requirements for the device, the effect of the inversesquare law on intensity of radiation, and the pressure and force on the antenna by photons. The success rate of the device in doubleblind tests is compared with the probability of detecting explosives by chance.

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