RT Level 1 questions with verified answers
1-1/2 minutes Ans✓✓✓ A good radiograph is obtained using
milliamperage of 15 milliamperes and an exposure time of 1/2 minute.
What exposure time will be necessary to produce an equivalent
radiograph if the milliamperage is changed to 5 milliamperes
10 mils Ans✓✓✓ When radiographing to the 2T quality level, an
ASTM penetrameter for 1/2in thick 2024 aluminum alloy has a
thickness of
100 kilovolt peak x-rays Ans✓✓✓ Which has the shortest wavelengths
1000 millicuries Ans✓✓✓ A curie is equivalent to
100mr/hr Ans✓✓✓ An unshielded isotope source gives a dose rate of
900mr/hr at 10 ft. What would be the dose rate at 30 ft
15 seconds Ans✓✓✓ Is an exposure time of 60 seconds was necessary
using a 4 ft source to film distance for a particular exposure, what time
would be necessary is a 2 ft source to film distance is used
186,000 miles per second Ans✓✓✓ The velocity of all electromagnetic
radiation is
2 Ans✓✓✓ Approx what percent of the original radioactivity is left
after 6 half lives
,200-800R Ans✓✓✓ Which dose would be dangerous, if not fatal, if
applied to the entire body in a short period of time
24 milliamperes-minute Ans✓✓✓ With a given exposure time and
kilovoltage, a properly exposed radiograph is obtained with 6
milliampere-minutes exposure at the distance of 20 in. It is desired to
increase the sharpness of detail in the image by increasing the source to
film distance to 40 in. The correct milliamperage-minutes exposure to
obtain the desired density at the increased distance is
370,000,000,000 (370 billion) disintegrations per second taking place
Ans✓✓✓ A radioactive source with an activity of 1 curie has
5 (N-18) Ans✓✓✓ The formula for determining permissible
accumulated personnel dose is
5 to 8 minutes in 68 degrees F Ans✓✓✓ The normal development time
for manually processing X-Ray film is
5.3yrs Ans✓✓✓ A cobalt-60 source has a half life of
6 minutes Ans✓✓✓ An excellent radiograph is obtained under given
exposure conditions with a tube current of 5 milliamperes and a
exposure time of 12 minutes. If the other conditions are not changed,
what exposure time would be required if the x-ray tube current could be
raised to 10 milliamperes
, 65 - 75 degrees F Ans✓✓✓ For best results when manually processing
film, solutions should be maintained with a temperature
75 mr/hr Ans✓✓✓ in making an isotope exposure in an unshielded
area, you find the dose rate 6 ft from the source is 1200mr/hr. What
would be the dose rate at 24ft
80 seconds Ans✓✓✓ Assuming that a good radiograph is obtained at a
setting of 10 milliamperes in 40 seconds, how much time will be
necessary to obtain one equivalent radiograph if the milliamperage
changes to 5 milliamperes
a dark intermittent or continuous line Ans✓✓✓ When radiographing a
part which contains a large crack, the crack will appear on the
radiograph as
a filter Ans✓✓✓ A thin metal sheet (Brass, copper, aluminum, etc.)
placed at the source to reduce effects of softer radiation is known as
a half life Ans✓✓✓ The time required for one-half of the atoms in a
particular sample of radioactive material to disintegrate is called
a high atomic number Ans✓✓✓ The best x-ray efficiency is produced
when the target material has
1-1/2 minutes Ans✓✓✓ A good radiograph is obtained using
milliamperage of 15 milliamperes and an exposure time of 1/2 minute.
What exposure time will be necessary to produce an equivalent
radiograph if the milliamperage is changed to 5 milliamperes
10 mils Ans✓✓✓ When radiographing to the 2T quality level, an
ASTM penetrameter for 1/2in thick 2024 aluminum alloy has a
thickness of
100 kilovolt peak x-rays Ans✓✓✓ Which has the shortest wavelengths
1000 millicuries Ans✓✓✓ A curie is equivalent to
100mr/hr Ans✓✓✓ An unshielded isotope source gives a dose rate of
900mr/hr at 10 ft. What would be the dose rate at 30 ft
15 seconds Ans✓✓✓ Is an exposure time of 60 seconds was necessary
using a 4 ft source to film distance for a particular exposure, what time
would be necessary is a 2 ft source to film distance is used
186,000 miles per second Ans✓✓✓ The velocity of all electromagnetic
radiation is
2 Ans✓✓✓ Approx what percent of the original radioactivity is left
after 6 half lives
,200-800R Ans✓✓✓ Which dose would be dangerous, if not fatal, if
applied to the entire body in a short period of time
24 milliamperes-minute Ans✓✓✓ With a given exposure time and
kilovoltage, a properly exposed radiograph is obtained with 6
milliampere-minutes exposure at the distance of 20 in. It is desired to
increase the sharpness of detail in the image by increasing the source to
film distance to 40 in. The correct milliamperage-minutes exposure to
obtain the desired density at the increased distance is
370,000,000,000 (370 billion) disintegrations per second taking place
Ans✓✓✓ A radioactive source with an activity of 1 curie has
5 (N-18) Ans✓✓✓ The formula for determining permissible
accumulated personnel dose is
5 to 8 minutes in 68 degrees F Ans✓✓✓ The normal development time
for manually processing X-Ray film is
5.3yrs Ans✓✓✓ A cobalt-60 source has a half life of
6 minutes Ans✓✓✓ An excellent radiograph is obtained under given
exposure conditions with a tube current of 5 milliamperes and a
exposure time of 12 minutes. If the other conditions are not changed,
what exposure time would be required if the x-ray tube current could be
raised to 10 milliamperes
, 65 - 75 degrees F Ans✓✓✓ For best results when manually processing
film, solutions should be maintained with a temperature
75 mr/hr Ans✓✓✓ in making an isotope exposure in an unshielded
area, you find the dose rate 6 ft from the source is 1200mr/hr. What
would be the dose rate at 24ft
80 seconds Ans✓✓✓ Assuming that a good radiograph is obtained at a
setting of 10 milliamperes in 40 seconds, how much time will be
necessary to obtain one equivalent radiograph if the milliamperage
changes to 5 milliamperes
a dark intermittent or continuous line Ans✓✓✓ When radiographing a
part which contains a large crack, the crack will appear on the
radiograph as
a filter Ans✓✓✓ A thin metal sheet (Brass, copper, aluminum, etc.)
placed at the source to reduce effects of softer radiation is known as
a half life Ans✓✓✓ The time required for one-half of the atoms in a
particular sample of radioactive material to disintegrate is called
a high atomic number Ans✓✓✓ The best x-ray efficiency is produced
when the target material has
