Roentgen equivalent man

Definition

The roentgen equivalent man (rem) is a unit used to measure the biological effect of ionizing radiation on human tissue. It combines the amount of radiation absorbed with its medical impact.

5 Must Know Facts For Your Next Test

1. 1 rem is equivalent to 0.01 sieverts (Sv) in the International System of Units.
2. Rem accounts for both the energy deposited and the effectiveness of that type of radiation in causing biological damage.
3. The rem unit takes into consideration different types of ionizing radiation, such as alpha particles, beta particles, and gamma rays, each with varying biological impacts.
4. Occupational exposure limits for radiation workers are often expressed in rems; typically, the limit is set to 5 rems per year.
5. The concept of dose equivalent measured in rems is crucial for ensuring radiological protection standards.

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Related terms

Sievert:

A unit measuring the health effect of ionizing radiation, where 1 sievert equals 100 rem.

Gray:

A unit that measures absorbed dose from any kind of radiation; it does not account for biological effects.

Ionizing Radiation:

Radiation that carries enough energy to liberate electrons from atoms or molecules, thereby ionizing them.