CAMRT ACTUAL TEST QUESTIONS WITH
COMPLETE ANSWER KEY
●● 90% of man made radiation to the population is related to?
Answer: Medical Radiography and Dental
●● For each peak xray voltage, what lead equivalent is required?
100kV or less (o-100)
Between 101kV-149kV
150kV or greater (150+)
Answer: 0-100kV = 0.25mm of lead
Greater than 100kV but less then 150kV = 0.35mm of lead
150kV or greater = 0.50mm of lead
●● What protective equipment is required during interventional
procedures
Answer: Full wrap around protective gowns of 0.50mm pb in the front
panels and 0.25mm pb in the back panels
,Thyroid shields with an equivalent of 0.50mm of pb
Lead drapes/curtains mounted to II of 0.25mm of pb at 100kv
●● What lead equivalent must protective gloves/ gauntlets possess?
Answer: 0.25mm of pb
●● What lead equivalent must ceiling mounted lead screens and
moveable shields provide?
Answer: 0.50mm of pb
●● What are the annual radiation dose limits for radiation workers?
Answer: Whole body= 20mSv
Lens of eye= 150mSv
Skin = 500mSv
Hands = 150mSv
All other organs = 500mSv
For pregnant women an effective dose of 4 mSv must be applied for the
remainder of the pregnancy from all sources
●● What are the annual radiation dose limits to members of the public?
Answer: Whole body = 1mSv
,Lens of the eye= 15mSv
Skin = 50mSv
Hands = 50mSv
All other organs = 50mSv
*these also apply for students*
●● What are primary protective barriers? Give examples
Answer: Primary barriers provide shielding from the direct xray beam.
Such as, the walls and floor where the tube can be directed
-The wall behind the wall bucky
-Floor under the table
●● What are secondary barriers and give examples
Answer: Provide shielding against both leakage and scattered radiation.
Walls that the primary beam is not directed towards and the ceiling are
secondary barriers.
The control booth is also a secondary barrier, the primary beam should
never be directed towards it.
●● What should the focal spot to skin distance be for:
, -Mobile equipment
-Stationary equipment
-Radioscopic equipment
Answer: Must not be less than:
-Mobile: 30cm
-Stationary: 38cm
-Radioscopic: 20cm (designed for special procedures that would be
impossible at 30cm or 38cm)
●● What are the maximum air kerma rates for radioscopic equipment:
-with automatic intensity control
-without AIC
Answer: Not equipped with AIC: 50mGy/min
With AIC: 100mGy/min
●● The air kerma rate must not exceed ___ from scattered radiation of
radioscopic equipment
Answer: 2 mGy/h
COMPLETE ANSWER KEY
●● 90% of man made radiation to the population is related to?
Answer: Medical Radiography and Dental
●● For each peak xray voltage, what lead equivalent is required?
100kV or less (o-100)
Between 101kV-149kV
150kV or greater (150+)
Answer: 0-100kV = 0.25mm of lead
Greater than 100kV but less then 150kV = 0.35mm of lead
150kV or greater = 0.50mm of lead
●● What protective equipment is required during interventional
procedures
Answer: Full wrap around protective gowns of 0.50mm pb in the front
panels and 0.25mm pb in the back panels
,Thyroid shields with an equivalent of 0.50mm of pb
Lead drapes/curtains mounted to II of 0.25mm of pb at 100kv
●● What lead equivalent must protective gloves/ gauntlets possess?
Answer: 0.25mm of pb
●● What lead equivalent must ceiling mounted lead screens and
moveable shields provide?
Answer: 0.50mm of pb
●● What are the annual radiation dose limits for radiation workers?
Answer: Whole body= 20mSv
Lens of eye= 150mSv
Skin = 500mSv
Hands = 150mSv
All other organs = 500mSv
For pregnant women an effective dose of 4 mSv must be applied for the
remainder of the pregnancy from all sources
●● What are the annual radiation dose limits to members of the public?
Answer: Whole body = 1mSv
,Lens of the eye= 15mSv
Skin = 50mSv
Hands = 50mSv
All other organs = 50mSv
*these also apply for students*
●● What are primary protective barriers? Give examples
Answer: Primary barriers provide shielding from the direct xray beam.
Such as, the walls and floor where the tube can be directed
-The wall behind the wall bucky
-Floor under the table
●● What are secondary barriers and give examples
Answer: Provide shielding against both leakage and scattered radiation.
Walls that the primary beam is not directed towards and the ceiling are
secondary barriers.
The control booth is also a secondary barrier, the primary beam should
never be directed towards it.
●● What should the focal spot to skin distance be for:
, -Mobile equipment
-Stationary equipment
-Radioscopic equipment
Answer: Must not be less than:
-Mobile: 30cm
-Stationary: 38cm
-Radioscopic: 20cm (designed for special procedures that would be
impossible at 30cm or 38cm)
●● What are the maximum air kerma rates for radioscopic equipment:
-with automatic intensity control
-without AIC
Answer: Not equipped with AIC: 50mGy/min
With AIC: 100mGy/min
●● The air kerma rate must not exceed ___ from scattered radiation of
radioscopic equipment
Answer: 2 mGy/h
