105 CMR, § 120.014

Current through Register 1537, December 20, 2024

Section 120.014 - Units of Exposure and Dose

(A) As used in 105 CMR 120.000, the unit of Exposure is the coulomb per kilogram (C/kg) of air. One roentgen is equal to 2.58 x 10^-4 coulomb per kilogram of air.

(B) As used in 105 CMR 120.000, the units of dose are:

Rad is the special unit of absorbed dose. One rad is equal to an absorbed dose of 100 ergs per gram or 0.01 joule per kilogram (0.01 gray).

Gray (Gy) is the SI unit of absorbed dose. One gray is equal to an absorbed dose of 1 joule per kilogram (100 rads).

Rem is the special unit of any of the quantities expressed as dose equivalent. The dose equivalent in rem is equal to the absorbed dose in rad multiplied by the quality factor (1 rem = 0.01 sievert).

Sievert is the SI unit of any of the quantities expressed as dose equivalent. The dose equivalent in sievert is equal to the absorbed dose in gray multiplied by the quality factor (1 sievert = 100 rems).

105 CMR, § 120.014

Amended by Mass Register Issue 1480, eff. 10/14/2022.