Unit used to measure radiation dosage (1/1000 of a rem)
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One millirem in a scientific notation is written as 10-3 rem.
One millirem is 1 x 10-3 rem, which can also be written as 1E-3 rem. Note that 1 x 10-3 is not the same as 1.0 x 10-3 which is not the same as 1.00 x 10-3. Those numbers have one, two, and three significant digits, respectively. That is, the second number is more precise than the first, and the third is more precise than the first two.