radiation biology 2 Flashcards
1
Q
ALARA principle
A
As low as reasonably acheivable
- use shielding
- low dose techniques (fixed kVp, variable mAs)
2
Q
radiation and pregnancy: 10 day rule
A
direct pelvic radiation to fertile females should be done only during first 10 days of menstrual cycle except in emergencies.
NOT VALID ANYMORE.
3
Q
personnel radiation exposure monitoring: Pocket dosimeters
A
ionization, chambers, electroscopes most precise but most expensive
4
Q
personnel radiation exposure monitoring: film badges
A
dental film packets incorporated into badge with filters. MOST economical but least accurate
5
Q
Effective dose equivalent (EDE) limit = Maximum permissible dose (MPD)
A
- adult non-pregnant workers: 5rem/yr (0.05 Sv)
lmtd to 1.25 rem (0.0125 Sv)/calendar quarter - pregnant workers: 0.5 rem/9 months (0.005 Sv)
- workers under age 18: 0.5 rem/yr (0.005 Sv)
6
Q
radiographs are owned by
A
facility/practitioner who took them