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registry prep 3
registry prep Qs 3
Question | Answer |
---|---|
Annual dose limit for a student | 100mrem (.1rem) |
Annual dose limit for the general population | .5rem (5msv) |
Early radiation exposure to a fetus may affect what system? | skeletal |
Later radiation exposure to a fetus may affect what system? | neurological |
Gestational dose limit for a fetus | 500mrem (5msv) |
SI unit for rad | Gy |
SI unit for rem | SV |
100rad to Gy | 1Gy |
100rem to SV | 1sv |
Rem formula | rad X QF |
An OSL dosimeter uses: | aluminum oxide |
A TLD dosimeter uses: | lithium flouride |
Name the rare earth phosphors | Gadolinium, Lanthanum, Yttrium |
Calcium tungstate emits what color? | blue/violet |
Rare earth phosphors emit what color? | green or blue |
Loss of overall density is a result of what grid error? | angulation error, off center error |
Loss of density at the periphery is a result of what grid error? | off focus/SID error or an upside-down grid |
mAs change used when switching from single phase to 3phase 6p | reduce by 2/3 |
mAs change used when switching from single phase to 3 phase 12p | reduce by ½ |
developer temp | 92-95F (35C) |
film storage temp | 70degrees F |
darkroom humidity level | 40-60% |