# Rem

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The **röntgen** (**roentgen**) **equivalent** in **man** or **rem** (symbol **rem**) is a unit of radiation dose.

## ExplanationEdit

It is the product of the absorbed dose in röntgens (R) and the biological efficiency of the radiation.

### DetailsEdit

More precisely, assuming a radiation weighting factor *rW*=1, 1 rem equals 1.07185 röntgen. The conversion factor has been readjusted from 1 to 1.07185 so that 100 rem equal 1 sievert;

### SI derived unitEdit

The sievert is the recommended SI derived unit, and in many cases is the legally prescribed unit.

#### Commonly usedEdit

A rem is a large amount of radiation, so the **millirem** (**mrem**), which is one thousandth of a **rem**, is often used for the dosages commonly encountered, such as the amount of radiation received from medical x-rays and background sources.

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