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would be more useful if it were to shout measurements in sieverts/hr rather than Gray/hr, but I can understand that would be a hell of a lot more complex ;)

Interesting all the same.

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"For X-rays and gamma rays, these are the same units as the sievert (Sv)."

http://en.wikipedia.org/wiki/Gray_(unit)

ADD: "Sievert = Biological effectiveness factor unique to the type of radiation * Gray"

http://www.hicare.jp/en/09/hi03.html

True, but Gray is for measurement of absorption by ANY material, Sievert is for measurement of absorption by biological material, so you would also need to apply the tissue weighting factor to the gray/hr measurement.

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