Chapter Ten Exam Flashcards
A visual inspector may not be a qualified technician to operate a radiation source, but still plays an important role in verifying quality. Which one of the roles should be assumed by the visual inspector? (Multiple Choice)
Check reports and qualifications
Radiation intensity is measured in which of the following units?
Roentgen, Coulomb per kilogram
The trefoil is the Canada-wide approved symbol that denotes:
X rays and gamma radiation hazard
How is the amount of exposure measured in a thermoluminescent dosimeter (TLD)?
By gently heating to release trapped radiation and measuring it.
Radiographic personnel in Canada are certified to
Can/CGSB 48.9712
Why will standards such as CSA W59 recommend a delay before radiography is carried out?
To permit possible formation of hydrogen cracks.
Acceptance criteria of RT images is based on:
Location, length, and type of flaw.
What does the discernible outline of a 0.51 mm thick IQI on a radiograph of a 22 mm thick weld mean?
Change of weld thickness of 0.51 (2.3%) is detectable
If it is not possible to place the IQI on the source side of the specimen, what can be done?
Place IQI on the film side but reduce the IQI by one size if required by the code or standard.
The image formation on radiographic film is dependent on which of the following?
thickness and density of the part under test
How do we verify image quality for RT?
Penetrameters
How are shorter wave lengths produced from an x-ray tube?
increasing the voltage
Which of the following types of electromagnetic waves has the shortest wavelength?
gamma rays
A radiographic indication 1 to 2 mm wide is observed running parallel to the toe of a double v-grove weld. Of the choices, which is the most likely?
undercut
Radiographic images are best viewed:
using a viewer in a dark room
Processing conventional radiographic film takes how many stages?
4 stages. developer immersion, stop bath, fixer immersion, and rinsing.
Electromagnetic radiation with wavelengths longer than visible light are:
radio, microwaves and infrared rays
Definition is influenced by:
geometric unsharpness due to fuzziness at the edge of the image
When handling film for development, quick removal from the carton can?
Can cause static from friction which artifacts.
Which electromagnetic wave is shorter?
gamma rays
The effect of increasing the voltage (kV) in an X-ray machine is to:
increase the intensity and shorten the wavelength
Contrast improves with?
X-rays
Which of the following statements is correct with regards to backing bar removal?
backing bars do not need to be removed but a badly fitted one could interfere with interpretation of image.
Planar discontinuities are not readily detected with radiography since:
They are not volumetric.
