My electronic arming dosimeter registers a .3 millirem, its first detection of radiation.
From the edition.cnn.com
In contrast, the average level of natural background radiation in the United States is about 350 millirem a year.
From the ecocentric.blogs.time.com
Because the EPA has another MCL that it takes more seriously, and that is, that people should not be exposed to more than 4 millirem per year.
From the forbes.com
More examples
The roentgen equivalent in man (or mammal:579) (abbreviated rem; symbol rem, or often but incorrectly R) is an older, CGS unit of equivalent dose, effective dose, and committed dose. Quantities measured in rem are designed to represent the stochastic biological effects of ionizing radiation, primarily radiation-induced cancer...
One thousandth of a rem
A unit of radiation dosage equal to one-thousandth of a rem [see definition, page 36]. According to federal standards, an individual is allowed to receive up to 500 millirem per year from nuclear fuel cycle activities. (OCRWM Transportation Program Reference. DOE/RW-0193.)
A unit of measure of ionizing radiation exposure of living tissues that takes into account the differences in biological harm (Relative Biological Effectiveness [RBE factor]) caused by different types of ionizing radiation, for example, 1 millirad of beta or gamma radiation exposure equals one ...