GLOSSARY - TM-11-6665-230-120057

TM 11-6665-230-12

GLOSSARY

DEFINITION OF UNUSUAL TERMS

Unit of measurement of the absorbed dose of ionizing radiation. It represents

CENTIGRAY

the absorption of 100 ergs of nuclear (or ionizing) radiation per gram of absor-

bing material or tissue. This unit of measurement is used interchangeably

with, and in lieu of, other units i.e., roentgen, milliroentgen, rad and millirad.

For military purposes, all types of radiation will be measured in centigray

(cGy).

ERG

The absolute centimeter-gram-second unit of energy and work. The work done

when a force of one dyne is applied through a distance of one centimeter.

MILLIRAD

One-thousandth of a rad [(1 mrad) (.001cGY) or 10 uGy (microgray per hour)]

[(1 mrad/h = 0.601 cGy/h or 10 uGy/h (microgray per hour)].

One-thousandth of a roentgen (mR/hr) (mrad/h) (.001 cGy/h).

MILLIROENTGENS

The unit of absorbed radiation dose equivalent to an energy deposition of 100

RAD

ergs/gin, i.e., a measure of the energy which the ionizing radiation imparts to

matter per unit of irradiated material (lrad = 1cGy centigram).

The spontaneous emission of radiation, generally alpha or beta radiation,

RADIOACTIVITY

often accompanied by gamma radiation from the nuclei of an unstable ele-

ment.

The internal unit of x-radiation or gamma radiation equal to the amount of

ROENTGEN

radiation that produces in one cubic centimeter of dry air at 0C and standard

atmospheric pressure ionization of either sign equal to one electrostatic unit

of charge. Term is used interchangeably with Rad (see centigram).

Is the act of reducing or preventing the passage of particles or radiation.

SHIELDING

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