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WorksheetsQuiz 7: Radiography Testing
Total questions: 10
Worksheet time: 30mins
An excellent radiograph is obtained under given conditions of exposure with the film located at a distance of 914.4 mm (36 in.) from the target of the x-ray tube. If the film is now placed only 457.2 (18 in.) from the target, and all exposure conditions except time are held constant, the new exposure time will be:
a. unchanged
b. longer by approximately 80%
c. shorter by approximately 55%
d. only about 25% as long as the original exposure time
The penetrating ability of an x-ray beam is governed by:
a. kilovoltage
b. time
c. milliamperage
d. source-to-film distance
Three liquids which are essential to process an exposed radiographic film properly are:
a. stop bath, acetic acid and water
b. developer, stop bath and H2O2
c. developer, fixer and water
d. acetic acid, fixer and stop bath
To decrease geometric unsharpness:
a. radiation should proceed from as small a focal spot as other considerations will allow
b. radiation should proceed from as large a focal spot as other considerations will allow
c. the film should be as far as possible from the object being radiographed
d. the distance from the anode to the material examined should be as small as is practical
As a check on the adequacy of the radiographic technique, it is customary to place a standard test piece on the source side of the specimen. This standard test piece is called:
a. a reference plate
b. a lead screen
c. an image quality indicator (IQI)
d. an illuminator
The radiation quality of a gamma ray source is:
a. determined by the size of the focal spot
b. determined by the isotope involved
c. varied by the operator
d. greater in Ir-192 than in Co-60
When referring to a 2T or 4T hole in the ASTM IQI, the T refers to the:
a. part thickness
b. plaque thickness
c. time of exposure
d. time for developing
Gamma radiation and x-radiation interact with matter and may be absorbed by:
a. photoelectric absorption
b. Compton scattering
c. pair production
d. all of the above
Low voltage x-ray tubes are generally fitted with windows made of:
a. plastic
b. beryllium
c. glass
d. lead
If it were necessary to radiograph a 177.8 mm (7 in.) thick steel product, which of the following gamma ray sources would most likely be used?
a. Co-60
b. Tm-170
c. Ir-192
d. Cs-137
