Dose Equivalent

DOE-HDBK-1188-2006

bodies, including, for example, management boards of non-government standards bodies.

[DOE O 1300.2A] [EH62dd1]

167.

DOSE EQUIVALENT (H). The product of absorbed dose (D) in rad (or gray) in tissue, a

quality factor (Q), and other modifying factors (N). Dose equivalent is expressed in units of rem

(or sievert) (1 rem = 0.01 sievert). (See Committed Dose Equivalent, Committed Effective

Dose Equivalent, Cumulative Total Effective Dose Equivalent, Deep Dose Equivalent, Effective

Dose Equivalent, Lens of the Eye Dose Equivalent, and Total Effective Dose Equivalent) [10

CFR 835.2]

168.

DRUG CERTIFICATION. A written assurance signed by an individual with known past illegal

drug involvement, as a condition for obtaining or retaining a DOE access authorization, stating

that the individual will refrain from using or being involved with illegal drugs while employed in a

position requiring DOE access authorization (security clearance). [10 CFR 707.4]

169.

EDUCATION. The successful completion of the requirements established by an accredited

educational institution. [DOE O 5480.20A] [EH62dd1]

170.

EFFECTIVE DOSE EQUIVALENT (EDE). The dose equivalent from both external and

internal irradiation defined by ΣτWτHτ, where Hτ is the dose equivalent in tissue T and Wτ is the

weighing factor representing the ratio of the risk arising from irradiation of tissue T to the total

risk when the whole body is irradiated uniformly. The effective dose equivalent is expressed in

units of rem. (See Committed Dose Equivalent, Committed Effective Dose Equivalent,

Cumulative Total Effective Dose Equivalent, Deep Dose Equivalent, Dose Equivalent, Lens of

the Eye Dose Equivalent, and Total Effective Dose Equivalent) [DOE O 6430.1A]

171.

EFFECTIVE DOSE EQUIVALENT (HE). The summation of the products of the dose

equivalent received by specified tissues of the body (Hτ) and the appropriate weighting factor

(wτ)-that is, HE = ΣwτHτ. It includes the dose from radiation sources internal and/or external to

the body. For purposes of compliance with 10 CFR 835, deep dose equivalent to the whole

body may be used as effective dose equivalent for external exposures. The effective dose

equivalent is expressed in units of rem (or sievert). (See Committed Dose Equivalent,

Committed Effective Dose Equivalent, Cumulative Total Effective Dose Equivalent, Deep Dose

Equivalent, Dose Equivalent, Lens of the Eye Dose Equivalent, and Total Effective Dose

Equivalent) [10 CFR 835.2]

172.

EIGHT (8)-HOUR TIME-WEIGHTED AVERAGE (TWA) EXPOSURE LIMIT. The

time-weighted average concentration in the employee's breathing zone which shall not be

exceeded in any 8-hour work shift of a 40-hour workweek. [DOE O 5480.10A (Draft)]