42 terms

Radiation Hazards/Protection - RADD 5001

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justification
optimization
dose limits
what are the three guiding principals in radiation protection
UNSCEAR
BEIR
what are the two regulatory agencies that provide risk estimates
ICRP
NCRP
what are the two regulatory agencies that are for radiation protection
12.5 mSv
what is the radiation dose limit for the whole body for a quarter of the year
187.5 mSv
what is the radiation dose limit for the hands, forearms, feet, and ankles for a quarter of the year
75 mSv
what is the radiation dose limit for the skin of the body for a quarter of the year
true
t/f: the fetus should not be exposed to more than 0.5 mSv per month after pregnancy is known
5 mSv
the total dose equivalent should not exceed what for the fetus over the gestational period
0.06 mSv
dental occupational exposure to radiation is about how much annually
true
t/f: dentist should order radiographs only when they expect that the additional diagnostic information will affect patient care
clinical/historical exam
what must proceed the selection to used radiographs in dentistry
yes
is it reasonable to accept that the information gained from a well justified radiograph outweighs the risk
BW
in the ideal case, what type of radiograph should be taken after closure of primary teeth
BW, PA or Pan
in the ideal case, what type of radiographs should be taken during transitional dentition
BW
in the ideal case, what type of radiographs should be taken during recalls based upon CRA
18
around what age should radiographs be taken for the third molars
2-3years
in the ideal case, if the patient does experience perio disease, recall patients should get bite wings how often
no
should the patient be exposed to an FMX if they have stayed disease free
no
should radiographs be taken on a 3 year old pt with no history, no disease, and open posterior contacts
FMX
what type of radiograph should be taken on a 37 year olds initial visit if they have 4-5 mm pockets and BOP
thyroid collar
the use of what blocks the radiation to the thyroid by 50%
rectangular
what type of collimation can reduce the patient effective dose by about 60%
digital receptors
what type of receptors require equal or lower doses than all others with comparable diagnostic qualities
collimation
the reduction of the diameter of the X-ray beam to about 7 cm
filtration
removable of low energy photons to reduce the radiation to a patient
as low as reasonably achievable
what does ALARA stand for
ALARA concent
every practical method should be used to reduce radiation exposure to all occupational and non occupational persons in the office
primary
scatter
leakage
what are the three potential sources of radiation to the operator of an X-ray unit
6 ft
how far away should the operator stand from the tube head
45 deg
what angle should you stand to the X-ray beam for the location of minimum exposure
yes
should you take X-rays on radiation therapy patients
0.25 mSv
how much radiation is the fetus exposed to during an FMX
congenital abnormalities
carcinogenesis
what are the two risks associated with the fetus during radiation
6%/grey
what is the risk for radiation induced cancer from exposure in utero
0.5 mSv
what is the occupational exposure to the fetus per month
no
if dental care is to be delayed until after pregnancy, should you take a radiograph
hematopoietic cells
thyroid gland
salivary gland
skin
what are the three organs exposed in dental radiograph that can contribute to cancer risk
children
what age group has a higher likelihood of getting thyroid cancer from dental radiation exposure
0.5 grey
dose associated with an elevated risk of parotid gland tumor
0.06 grey
dose associated with an elevated thyroid cancer risk in children
0.25 grey
dose associated with an elevated skin cancer risk
cumulative
effects of radiation are ________.
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