RT Level 2 questions with verified answers
A Cobalt-60 gamma ray source has an approximate practical thickness
limit of: Ans✓✓✓ 9 inches of steel or its equivalent.
A device which is basically a combination of a magnet and transformer
designed to guide and accelerate electrons in a circular orbit to very high
energies is called a: Ans✓✓✓ Betatron.
A gas-filled region located in an electrical field created by electrodes
across which a potential difference is applied forms the major portion of:
Ans✓✓✓ An ionization chamber.
A general rule governing the application of the geometric principles of
shadow formation states that: Ans✓✓✓ the central ray should be as
nearly perpendicular to the film as possible, to preserve spatial
relationships.
A good cobalt-60 radiograph is made on a 3 inch steel casting using an
exposure time of 10 minutes and a source-to-film distance of 36 inches.
It is necessary to change the source-to-film distance to 24 inches, what
exposure time would produce a similar radiograph if all other conditions
remain the same ? Ans✓✓✓ 4.4 minutes.
A lead sheet containing a pinhole may be placed halfway between the X-
ray tube and the film in order to: Ans✓✓✓ determine the approximate
size of the focal spot.
, A monochromatic X-ray beam: Ans✓✓✓ is a beam consisting of a
single wavelength.
A voltage selector consisting of an iron core transformer with a single
winding having a series of taps at various points on the winding is
called: Ans✓✓✓ An autotransformer.
Almost all gamma radiography is performed with: Ans✓✓✓ Iridium-
192 or cobalt-60.
An ASTM penetrameter for use when inspecting a one-half inch thick
steel plate to the 2-2T quality level using a 15 inch source-to-film
distance would be made of: Ans✓✓✓ 10 mil thick steel.
An x-ray film having wide latitude also has, by definition: Ans✓✓✓
Low contrast.
An X-ray tube is rated for a maximum of 250 kVp. This tube may be
operated at a maximum of: Ans✓✓✓ 250,000 volts peak voltage.
An X-ray tube with a small focal spot is considered better than one with
a large focal spot when it is defined to obtain: Ans✓✓✓ Better
definition.
As the effective energy of the radiation increases up to about 250kV:
Ans✓✓✓ Film graininess increases.
A Cobalt-60 gamma ray source has an approximate practical thickness
limit of: Ans✓✓✓ 9 inches of steel or its equivalent.
A device which is basically a combination of a magnet and transformer
designed to guide and accelerate electrons in a circular orbit to very high
energies is called a: Ans✓✓✓ Betatron.
A gas-filled region located in an electrical field created by electrodes
across which a potential difference is applied forms the major portion of:
Ans✓✓✓ An ionization chamber.
A general rule governing the application of the geometric principles of
shadow formation states that: Ans✓✓✓ the central ray should be as
nearly perpendicular to the film as possible, to preserve spatial
relationships.
A good cobalt-60 radiograph is made on a 3 inch steel casting using an
exposure time of 10 minutes and a source-to-film distance of 36 inches.
It is necessary to change the source-to-film distance to 24 inches, what
exposure time would produce a similar radiograph if all other conditions
remain the same ? Ans✓✓✓ 4.4 minutes.
A lead sheet containing a pinhole may be placed halfway between the X-
ray tube and the film in order to: Ans✓✓✓ determine the approximate
size of the focal spot.
, A monochromatic X-ray beam: Ans✓✓✓ is a beam consisting of a
single wavelength.
A voltage selector consisting of an iron core transformer with a single
winding having a series of taps at various points on the winding is
called: Ans✓✓✓ An autotransformer.
Almost all gamma radiography is performed with: Ans✓✓✓ Iridium-
192 or cobalt-60.
An ASTM penetrameter for use when inspecting a one-half inch thick
steel plate to the 2-2T quality level using a 15 inch source-to-film
distance would be made of: Ans✓✓✓ 10 mil thick steel.
An x-ray film having wide latitude also has, by definition: Ans✓✓✓
Low contrast.
An X-ray tube is rated for a maximum of 250 kVp. This tube may be
operated at a maximum of: Ans✓✓✓ 250,000 volts peak voltage.
An X-ray tube with a small focal spot is considered better than one with
a large focal spot when it is defined to obtain: Ans✓✓✓ Better
definition.
As the effective energy of the radiation increases up to about 250kV:
Ans✓✓✓ Film graininess increases.
