ionizing radiation - Answer-x rays produce electrically charged particles along their path
BERT method - Answer-background equivalent radiation time
compares amount of radiation received from imaging procedure with natural background radiation received over a period of time
thickness of lead...
RADT 150 Final Exam Questions with
Latest Update
ionizing radiation - Answer-x rays produce electrically charged particles along their path
BERT method - Answer-background equivalent radiation time
compares amount of radiation received from imaging procedure with natural
background radiation received over a period of time
thickness of lead apron - Answer-.25 mm Pb
Primary barriers - Answer-straight in the path of photons
7 ft high
1/16" lead equiv
ex: doors, walls
Secondary barriers - Answer-absorb scatter radiation
to the ceiling
1/32" lead equiv
ex: wall of control booth
max leakage allowed by tube housing - Answer-100 mR/hr at 1m away
Fluoroscopic protection - Answer-protective curtain
bucky slot cover
exposure timer
dead man switch
rotating personnel
lead apparel
Where to stand during mobile radiography - Answer-6 ft away, 90 degrees from source
Where to stand during C-arm procedures - Answer-behind physician
factors that influence room design and barriers - Answer-workload
use
occupancy
workload - Answer-avg radiation output x days per week room used
use factor - Answer-direction of beam for % of time
occupancy factor - Answer-occupancy of space behind barrier (controlled vs
uncontrolled)
,Aperture diaphragm - Answer-lead below housing with a hole which allows straightest
radiation to leave the beam
cones and cylinders - Answer-create round beam/exposure field
Radiography minimum distance - Answer-fixed: 15 in
mobile: 12 in
Fluoroscopy minimum distance - Answer-fixed: 15 in
mobile (C-arm): 12 in
Types of patient exposures - Answer-skin dose
entrance skin exposure
gonadal dose (genetically significant dose)
bone marrow dose
Sources of radiation - Answer-natural and man made (artificial)
man made radiation - Answer-50% - 315 mRem
medical/dental 5%
nuc med 12%
interventional 7%
CT 24%
consumer products 2%
nuclear fallout .3%
occupational .1%
industrial .1%
Somatic or genetic damage - Answer-mutations, cataracts, leukemia
1968 Radiation Control Act - Answer-protects public from unnecessary exposures from
consumer products
1981 Consumer Patient Radiation Health and Safety Act - Answer-set minimum
education standards
2005 CARE bill - Answer-required national licensure for technologists
, Dosimeter - Answer-device that measures individual occupational exposure
Film badge - Answer-plastic holder, film packet, filters
darker film = larger exposure
aluminum filter measures shallow dose, copper filter measures deep dose
Control badge - Answer-kept in radiation free area
records radiation during transport which is subtracted from personnel devices
OSL dosimeter - Answer-plastic holder, filters, aluminum oxide
read with a laser light
TLD dosimeter - Answer-plastic holder and lithium fluoride crystals
read by TLD analyzer
exposure = intensity of light
Pocket Ionization Chamber - Answer-most sensitive
used by medical physicists
gives immediate feedback
Ionization chamber - Answer-most common area monitoring device
gas filled ionization chamber that measures x-ray, gamma, or beta radiation over a
period of time
Proportional counter - Answer-can detect low levels of radioactive contaminations
used in a lab setting
Geiger-Muller counter - Answer-can detect lost sources of radiation
has audible alarms that become louder as it gets closer to the source
Tolerance dose - Answer-amount of dose a person can be continually exposed to
without harmful effects
replaced by MPD
Threshold dose - Answer-dose below which an individual has a negligible chance of
biological damage
Max Permissible Dose - Answer-minimal dose without appreciable damage
Exposure - Answer-amount of radiation a person is subjected to
measured in Roentgen
Absorbed dose - Answer-amount of energy deposited in an irradiated object per unit
mass
measured in Gray/RAD
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