# Roentgen definition

Roentgen means the special unit of exposure. One roentgen (R) equals 2.58E-4 coulombs per kilogram of air (see "Exposure" and 12VAC5-481-240).
Roentgen. (R) means the special unit of exposure. One roentgen equals 2.58 x 10-4 coulombs/kilogram of air.
Roentgen means the special unit of exposure. One roentgen (R) equals 2.58 × 10-4 coulombs/kilogram of air (see “Exposure” and 38.4(4)).

## Examples of Roentgen in a sentence

For example, a measured entrance exposure of 0.50 Roentgen from a Mo/Mo Target Filter system at 30 kVp with a measured HVL of 0.36-mm aluminum yields an average glandu- lar dose of (0.50 R) × (174 mrad/R) = 87 mrad or 0.87 mGy.*Wu X.

One Roentgen is equal to 2.58 x 10-4 Coulomb per kilogram of air.

A measurement of the biological effects resulting from ionizing radiant energy where Roentgen is the amount of radiation leading to the absorption of 88 ergs of energy per gram of air.

RULE 41.6(136C)—APPENDIX IRescinded IAB 4/5/00, effective 5/10/00RULE 41.6(136C)—APPENDIX IIGlandular Dose (in mrad) for 1 Roentgen Entrance Exposure4.5-cm Breast Thickness—50% Adipose/50% Glandular Breast Tissue* To convert from entrance exposure in air in Roentgen to mean glandular breast dose in millirads, multi- ply the entrance exposure by the factor shown in the table for the appropriate kVp and beam quality (HVL) combination.

The use of reward to help reduce agency spend often occurs in the service.

## More Definitions of Roentgen

Roentgen. (R) means the special unit of exposure and is equal to the quantity of x or gamma radiation which causes ionization in air equal to 258 microcoulomb per kilogram (see “Exposure”).
Roentgen or “R” means the special unit of exposure. One roentgen equals 2.58E−4 coulombs per kilogram of air.
Roentgen. (R) means the special unit of EXPOSURE. One roentgen equals 2.58 x 10-4 coulombs per kilogram of air. See EXPOSURE.
Roentgen means the special unit of exposure. One roentgen (R) equals 2.58 x 10-4 coulombs per kilogram (C/kg). (See "Exposure" and Section 310.140 of this Part.)
Roentgen means the traditional unit of exposure. One roentgen (R) equals 2.58E-4 coulombs per kilogram of air (see "Exposure" and Part A.9.1 of this part.)
Roentgen. (R) means the special unit of EXPOSURE. One roentgen equals 2.58 x 10 to the -4 power coulombs per kilogram of air. See EXPOSURE.
Roentgen means the special unit of exposure. One roentgen (R) equals 2.58 × 10-4 coulombs per kilogram of air.