Protection Unit 4 Dreaded #s Flashcards
Annual public limit
infrequent exposure
.5 rem
Annual Public limit
natural
.1rem
Cumulative EfD
exposed
agex1rem
Embryo/fetus
as well as per month
.5rem for total gestation
less than .05rem/mo
Lens of Eye
15 rem
Extremities
50 rem
What is intensity of beam when at a 90° to source at 1m distance
1m
PPB Barriers
1/16”
7FT TALL
SPS
1/32”
must overlap with PPB 1/2
How many events does scatter go through before reaching control booth
2
Max scatter allowed behind control booth
100 mrem/week
window in booth amt lead
1.5 mmpb
Portable shields amt lead
.5 mm pb
Tube housing leakage allowance
at 1 m cannot exceed 100 mr/hr
Flouro protective curtain
.25 mm
bucky slot shielding
.25 mm
thyroid shields
.5 mm
Eyeglasses
.35mm
wordload measured in
mas/wk
ma/min
controlled areas limit
100 mrem
uncontrolled areas
2 mrem/week