Card Set Information
define the acronym ALARA
as low as reasonably achievable- having to do with radiation exposure
how are filters used in basic radiation protection?
absorb low energy x-rays before reaching pt
how are collimators used in radiation protection?
restricts x-ray beam to the area to be viewed
how are intensifying screens used in rad protection?
reduce x-ray exposure by 95%
what are the 3 guidelines for x-ray exposure for women of childbearing age?
elective booking, patient questionarre, postings
1st commandment of radiology
time, distance and shielding
don't let familiarity result in false security
never stand in primary beam
what is radiobiology?
the study of the effects of ionizing radiation on the biologic tissue
state the 50/60 lethal dose principle
the lethal dose of radiation to the whole body that will result in death within 60 days to 50% of irradiated subjects
direct effect of radiation
if the initial ionizing event occurs on the most radiosensitive molecule, dna, the effect is direst
effects of direct radiation
molecular alteration, biochemical lesion, cell death, death, organ damage, tissue damage
indirect effect of radiation
ex- water is ionized, then transferred to dna
effects of indirect radiation
molecular alteration, biochemical lesions, point mutations, genetic damage
define doubling dose
dose of radiation that will produce twice the frequency of genetic mutations as would have been observed without radiation
unit of radiation intensity
roentgen absorbed dose
measures radiation absorbed by pt
roentgen equivalent man
measures radiation absorbed by tech