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RADT 456: Rad Prot.

ARRT registry review covering radiation protection

QuestionAnswer
Interaction that contributes significantly to patient dose photoelectric effect
interaction that contributes to image fog and pose a radiation hazard to personnel compton scatter
cardinal principles of radiation protection time, distance, and shielding
dose response curve that is proportional to the radiation dose received only after some particular dose is received linear threshold
dose response curve that does not occur with degrees of severity, referred to as stochastic effects, no safe dose linear nonthreshold
dose response curve in which the effects of radiation are not proportional to the dose received nonlinear curve
usually a result of high dose in short period of time early somatic effects
can appear years after exposure: carcinogenesis, cataractogenesis, embryologic effect, lifespan shortening late somatic effects
states that the most radiosensitive cells are young, undifferentiated, and highly mitotic cells Law of Bergonie and Tribondeau
the sum of the products of the dose equivalent to various irradiated organs or tissues and their applicable weighting factors effective dose equivalent
the rate at which radiation deposits energy as it passes through tissue is known as linear energy transfer (LET)
the most radiosensitive cell lymphocyte
as the LET of radiation increases, the radiation's ability to produce biologic damage also increases -true or false true
diagnostic x-rays are considered high LET radiation- true or false false, low LET radiation
occurs with high LET radiation and when ionization occurs at the DNA molecule direct effect
occurs most frequently, happens when ionization takes place away from the DNA molecule, in cellular water indirect effect
the indirect effect is predominant with high or low LET radiation low
radiographers must follow _____ as they carry out their tasks the ALARA principle
what is the safest time to schedule elective procedures of the abdomen/pelvis for female patients 10-day rule, the first 10 days following onset of the menses
the single most important factor in keeping patient dose to a minimum beam restriction
removes low-energy x-rays from primary beam, thereby reducing patient skin dose and increasing the average energy of the beam filtration
equipment operated above 70 kV must have at least _____ mm Al equivalent 2.5
______ should be used if gonads lie within 5 cm of collimated beam, if patient has reproductive potential, and if diagnostic objectives permit gonadal shielding
reproducibility- any variation in output intensity must not exceed 5%
linearity- any variation in output intensity must not exceed 10%
SSD must not be fewer than ___ inches for all radiographic procedures other than dental radiography 12
the tabletop intensity of the fluoroscopic beam must be fewer than 10R/min
most occupational exposure is received in what 2 areas fluoroscopy and mobile radiography (especially c-arm)
the rem SI unit of measurement is Sv (Sievert)
measures ionization in air and can be referred to as the unit of exposure roentgen
contains a thin layer of aluminum oxide optically stimulated luminescence (OSL) dosimeter
Created by: bmhedinger