rem

REM rapid eye movements (see under sleep ).

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rem (rem) r oentgen-e quivalent–m an: the amount of any ionizing radiation that has the same biological effectiveness as 1 rad of x-rays; 1 rem = 1 rad × RBE (relative biological effectiveness).

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REM

abbr.

rapid eye movement

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rem (rm)

n.

The amount of ionizing radiation required to produce the same biological effect as one rad of high-penetration x-rays.

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rem

[rem, är′ē′em′]

abbreviation for roentgen equivalent man, a dose of ionizing radiation that produces in humans the same effect as one roentgen of x-radiation or gamma radiation. See also sievert.

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REM

[rem, är′ē′em′]

abbreviation for rapid eye movement. See sleep.

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REM,

n rapid eye movement; the cyclical phase of sleep that occurs roughly every 90 minutes and lasts from 5 to 30 minutes; is associated with dreaming.

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rem (roentgen-equivalent-man),

n a unit of absorbed radiation dose adjusted for biologic effects equivalent to 1 rad of 250 kV roentgen rays (dental and cephalometric roentgen rays require less than 100 kV).

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REM

rapid eye movement. See also sleep.

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rem

acronym for roentgen equivalent man; the amount of any ionizing radiation which has the same biological effect as 1 rad of x-rays; 1 rem = 1 rad × RBE (relative biological effectiveness). Now replaced by the sievert (Sv) SI unit. 1 Sv = 100 rem.

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rem

Roentgen-equivalent in man Radiation physics The traditional unit of equivalent dose/unit of absorbed radiation, ± equal to a rad or 0.01 Seivert–Sv, the unit that replaces the rem–1 Sv = 100 rem. See Gray, Rad, Sievert.