The company says its Single Pose Secure scanner uses an extremely low-dose X-ray, equivalent to spending two minutes on an aircraft.

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The radiation dose from an individual dental X-ray, Dr Claus points out, has gone down by about half over the past 30 years or so.

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"To put that into context, 20mSv is the same dose you get from three computed tomography (X-ray) scans of your chest, roughly, " she told reporters.

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Even subsistence fishermen, who eat far more fish than the typical American, would receive a dose of radiation from the cesium isotopes released in the meltdown equivalent to a single dental X-ray, Fisher and his colleagues reported.

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