Hard to remember ARRT

NCRP 102 of aprons MUST be vs SHOULD be

must: .25 mm Pb

should: .5 mmPb

NCRP 102 of gloves MUST be

.25 mm Pb

primary barrier (for primary beam) lead equivalent number

1.6 mm OR 1/16 inch

secondary barrier (for scatter) lead equivalent number

.8 mm OR 1/32 inch

thyroid shielding lead equivalent

.5 mm Pb

glasses shielding lead equivalent

.35 mm Pb

gloves/drapes/bucky slot shielding lead equivalent

.25 mm Pb

control booth shielding lead equivalent

.8 mm Pb

control booth WINDOW shielding lead equivalent

1.6 mm Pb

inverse square law formula

new distance = (old intensity)(old distance/new distance)²

NCRP annual occupational exposure

50 mSv (.05 sieverts)

NCRP 116 occupational exposure to lens, skin, hands, feet

lens: 150 mSv

skin/hands/feet: 500 mSv

public exposure & students effective dose: continuous, infrequent, lens, skin/hands

continuous: 1 mSv

infrequent: 5 mSv

lens: 15 mSv

skin/hands: 50 mSv

NCRP 116 fetus: monthly, entire gestation

monthly: 0.5 mSv

entire gestation: 5 mSv