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33 Cards in this Set
- Front
- Back
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when to wear your personal radiation monitor |
anytime when working with radiation |
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dose response relationship is a relationship between different _ doses and t he _ of the observed dose |
radiation, magnitude |
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basis for radiation protection standards is _ _ dose response relationship |
linear, non threshold type |
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define linear |
exposure increases, risk increases |
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radiation exposure limits set by |
IRCP |
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MPD |
max permissible dose |
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MPD |
annual recommended dose or regulatory dose limits |
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MPD whole body |
rad worker - 20mSv public - 1mSv |
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MPD lens of eye |
rad worker - 150mSv public - 15mSv |
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MPD of skin, hands, other organs |
rad worker - 500mSv public - 50mSv |
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accidental exposure - owner responsibilites |
ensure equipment installed and used at level of good safety standards |
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three principle ways to describe patient exposure |
ESE, GSD, MMD |
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for mobiles, operator must stand out of _ _ at least _ meters away from tube |
primary beam, 3meters |
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_ gives more exposure than radiography |
fluoroscopy |
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highest occupational exposure comes from |
mobile, fluoro, angio |
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at 100kv, lead drapes must have _ |
0.25mm lead eq |
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at 100kv, bucky slot over must have _ |
0.5mm lead eq |
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test protective equipment _ |
yearly |
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equal or less than _ unaccceptable for protective equipment |
670mm^2 |
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equal or less than _ diatmeter circle unacceptable if in thyroid or gonad area |
5mm |
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ESE uses _ to measure |
TLDs |
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ESE is higher than _ |
absorbed dose |
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calculating ESE |
mR/mAs |
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GSD |
gonadal dose (genetic dose) |
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MMD |
mean marrow dose |
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MMD |
average bone marrow exposure over entire bone marrow of person |
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if 25% of active bone marrow recieves 30mrad, MMD is |
30mrad/4 = 7.5 mrad |
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MMD |
is a somatic index
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MMD measures _ not _ |
dose, effect |
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MMD estimates lower in _ since bone marrow spread through entire body and exposures are lower |
children |
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equipment requirements for CT |
irradiation control, visual indications, emergency termination, focal spot to skin distance, x-ray beam quality, preview image, light field, motion of patient support |
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CR imaging plates |
reuseable, exposed, read and erased repeatedly |
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_ visual inspection recommended and _ cleaning following manufacturer recommendation |
weekly, month |
