millirem math

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Nick Berigan
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millirem math

Postby Nick Berigan » Tue Nov 24, 2009 6:40 am

from cnn
"One worker was found to have received 16 millirem of exposure, and others received lower levels of contamination. The annual occupational dose limit for workers at Exelon plants is 2,000 millirem, the statement said. (presumably they mean "a worker" here)

Radiation exposure from a chest X-ray is about 6 millirem, according to the Nuclear Regulatory Commission."

So that means an acceptable annual dose is equivalent to 333 xrays?

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Re: millirem math

Postby thebookpolice » Tue Nov 24, 2009 8:23 am

2 - One chest X-ray (the whole body equivalent). A typical X-ray exposes the chest to a dose equal to 20 millirems at the entrance and 1 milliRem at the exit. Averaging this exposure over the whole body yields a whole body equivalent of about 2 millirems.

2 - Annual exposure due to watching four hours of television every day.

The maximum permissible exposure for a person under 18 working with radiation is one-tenth the adult limit or not to exceed 500 millirems per year above the 300+ millirems of natural sources, plus medical radiation. This was established in 1957 and reviewed as recently as 1990.

(Bear in mind, this is from 1994, but the math is the same.)

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