Questions Flashcards
high bone marrow examinations
- barium enema
- upper GI series
- abdominal angiography
biological effects of ionizing radiation that are manifested in offspring
genetic effects
cell line used as an indicator of somatic effects of radiation
bone marrow
photocathode gives off what in proportion to the intensity of fluorescent light?
electrons
in an x-ray system with ABC and an x-ray tube BELOW the table, moving the image intensifier AWAY from the patient will do what to the patient’s radiation exposure?
increase
cell type most sensitive to radiation
lymphocytes
strong correlation between the mean radiation dose received by bone marrow and what?
leukemia
what is half-value layer (HVL)?
thickness of absorbing material necessary to reduce x-ray intensity to 1/2 its original value
collision between an x-ray photon and INNER orbital electron, knocking the electron out of its orbit
photoelectric effect
what organ is NOT used for somatic dose measurements
thyroid
what are required to be posted in x-ray areas?
- form RH-2364 “Notice to Employees”
- copy of operating procedures
tighter collimation to reduce the FOV will cause image brightness to
reduce
minimum lead equivalent thickness for protective aprons
0.5 mm
probability of an effect occurring
stochastic effect
severity of an effect that has occurred
nonstochastic effect, aka, deterministic effect
in digital imaging, adjusting the window level changes
contrast
photoconductive target function
allows an electron charge to be generated
can operator exposure occur after the dead-man switch is released?
NO
hypothesis states that any radiation dose has some degree of effect
non-threshold
type of sterility resulting from a 50 rad exposure to gonads
temporary
reason filters are used in film badges
measure doses over a wide range of energies
type of image receptor converts x-rays into an electrical charge using an array (matrix) of detector elements
flat panel detector
bucky slot cover lead equivalent thickness
0.25 mm
dose equivalent limit to an embryo/fetus during the ENTIRE pregnancy for an occupational exposure of a pregnant woman
5 mSv