The radiation ______ is a number assigned to different types of ______ in order to
better determine their effect on tissue examples xray vs alpha particles.
The annual occupational dose equivalent limit for the thyroid, skin and extremities is
_______
a. 200 mSv aka 50 rem.
b. 300 mSv aka 50 rem.
c. 500 mSv aka 50 rem. - <<ANSWER>>c. 500 mSv aka 50 rem
Bushong 8th edition page 557
A time of 1.5 minutes is required for a particular fluoroscopic examination, whose
exposure rate is 275 mR/h. What is the approximate radiation exposure for the
radiologic staff present in the fluoroscopy room during the examination
a. 183 mR
b. 68.7 mR
c. 18.33 mR
d. 6.87 mR - <<ANSWER>>d. 6.87 mR
{(275 mR/h) / 60minutes } / 1.5 minutes = 6.87 mR
Bushong 8th edition page 570
If the exposure rate to an individual standing 4.0 m from a source of radiation is 10
mR/h what will be the dose received after 20 minutes at a distance of 6 m from the
source
a. 22.5 mR
b. 7.5 mR
c. 4.44 mR
d. 1.48 mR - <<ANSWER>>d. 1.48 mR
Bushong 8th edition page 570
,I1/I2 = D2^2/D1^1
(10mR/h) / ? =6^2 /4^2 =4.44 mR then convert to minutes = 1.48 mR
All the following statements regarding mobile radiographic equipment are true except
a. the exposure cord must permit the operator to stand at least 6 ft from the patient xray
tube and useful beam
b. exposure switches must be the two stage type
c. a lead apron should be carried with the unit and worn by the radiographer during
exposure
d. the radiographer must alert individuals in the are before making the exposure -
<<ANSWER>>b. exposure switches must be the two stage type
NCRP Report No 102 page 25
______ states that the exposure switch on mobile radiographic units shall be so
arranged that the operator can stand at least ______from the patient, xray tube, and
useful beam
a. NCRP Report No 106/2 m or 6 ft
b. NCRP Report No 122/2 m or 6 ft
c.NCRP Report No 102/2 m or 6 ft - <<ANSWER>>c. NCRP Report No 102/2 m or 6 ft
NCRP Report No 102 page 25
The fluoroscopic and/or radiographic exposure switch or switches must be of the
______ that is the exposure will terminate should the switch be released
1. dead man type
2. live man type
3. two prong type - <<ANSWER>>1. dead man type
NCRP Report No 102 page 25
The radiographer must be certain to ________, enabling unnecessary occupants to
move away before making the exposure
1. alert individuals in the area
2. not alert individuals in the area
3. put message on blackboard for individuals in the area - <<ANSWER>>1. alert
individuals in the area
, NCRP Report No 102 page 25
Which of the following cells types has the greatest radiosensitivity the adult human
a. Nerve cells
b. Muscle cells
c. Spermatids
d. Lymphocytes - <<ANSWER>>d. Lymphocytes
The Wr of the different ionizing radiations depends on the ______ of that particular
radiation.
1. BET
2. EBT
3. LET - <<ANSWER>>3. LET
Bushong 8th edition page 556
The following formula is used to determine effective dose E:
1. E=Wr x Wt x absorbed dose
2. E=Wr + Wt + absorbed dose
3. E=Wr - Wt - absorbed dose - <<ANSWER>>1. E=Wr x Wt x absorbed dose
Bushong 8th edition page 556
According to the national council on radiation protection and measurements NCRP, the
monthly gestational dose equivalent limit for embryo/fetus of a pregnant radiographer is
a. 0.1 mSv
b. 0.5 mSv
c. 1.0 mSv
d. 5.0 mSv - <<ANSWER>>b. 0.5 mSv
Bushong 8th edition page 557
________ which expresses the rate at which particulate or photon energy is transferred
to the absorber
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