Radiation Safety
What does ALARA stand for?
As low as reasonably achievable
The unit used to express occupational exposure
mSv and/or rem
Per the NCRP, lead aprons are recommended to be a thickness of ______mm lead equivalent.
0.5 mm
TLD stands for
Thermoluminescent dosimeter
Law of Bergonie and Tribondeau
What are the 3 Cardinal rules of radiation protection?
Time, distance and shielding
The unit used to express patient dose
Gray and/or Rad
What is the lead equivalent thickness of the primary barrier walls?
1/16"
TLD radiation monitor has what advantage?
It cannot be fogged with heat and humidity.
What are areas of the body that are sensitive to radiation?
lens of the eyes, thyroid, skin, small bowel and gonads
Of the 3 Cardinal rules, which is the most important to the technologist?
Distance
What is the annual allowable radiation dose for occupational workers?
50 mSv (5 rems)
What is the lead equivalent thickness of secondary barrier walls?
1/32"
The film badge has 2 advantages
inexpensive and accurate
What areas of the body are resistant to radiation?
Brain, muscle and central nervous system
What does non-threshold dose response tell us?
There is no safe dose of radiation.
Which interaction is responsible for most of our occupational exposure?
Compton scatter
What is the most important thing we can do to ensure we have the right patient for the right exam?
Check the patient identifiers.
During fluoroscopy, the film badge should be worn where?
What is the most radiosensitive period of human growth?
The embryonic and fetal period.
Our occupational dose is based on which dose response?
Non-threshold.
It is most dangerous to receive a large dose of radiation over what period of time?
Short period of time.
What is erythema?
Reddening of the skin.
Pregnant technologists are given a 2nd badge to monitor fetal dose. Where is that badge worn?
At the waist, under the apron.
What is epilation?
Hair loss.