Appendix 2C. Non-Uniform Exposure of the Skin

DOE-STD-1098-99

Radiological Control

Radiological Standards

June 2004

Appendix 2C

Non-Uniform Exposure of the Skin

Non-uniform exposures of the skin from X-rays, beta radiation, and radioactive materials on the skin, including hot

particles, shall be assessed and recorded as specified in the table below [see 835.205(a)].

AREA OF SKIN

METHOD OF AVERAGING, ADDING TO OTHER DOSES RECEIVED, AND

IRRADIATED

RECORDING NON-UNIFORM SKIN DOSE

> 100 cm2

Averaged over the 100 cm2 of skin receiving the maximum dose

[see 835.205(b)(1)]

Added to any uniform dose equivalent also received by the skin

Recorded as the annual extremity or skin (shallow) dose equivalent (H)1

≥ 10 cm2 and < 100 cm2

Averaged over the 1 cm2 of skin receiving the maximum dose (D), reduced by the

fraction (f) which is the irradiated area in cm2 divided by 100 cm2 (i.e. H=fD)

[see 835.205(b)(2)]

Added to any uniform dose equivalent also received by the skin

Recorded as the annual extremity or skin (shallow) dose equivalent1

< 10 cm2

Averaged over the 1 cm2 of skin receiving the maximum dose

[see 835.205(b)(3)]

Not added to any other dose equivalent, extremity or skin (shallow) dose equivalent

recorded for the annual dose equivalent

Recorded in a individual's radiation dose record as a special entry 1

Recording of shallow dose equivalents resulting from non-uniform exposure of the skin is not required if the resulting

dose is less than 1 rem [see 835.702(b)].

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