radiation biology 2 Flashcards

1
Q

ALARA principle

A

As low as reasonably acheivable

  • use shielding
  • low dose techniques (fixed kVp, variable mAs)
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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.

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3
Q

personnel radiation exposure monitoring: Pocket dosimeters

A

ionization, chambers, electroscopes most precise but most expensive

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4
Q

personnel radiation exposure monitoring: film badges

A

dental film packets incorporated into badge with filters. MOST economical but least accurate

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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)
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6
Q

radiographs are owned by

A

facility/practitioner who took them

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