ToM_Radiography

Which of the following types of intensifying screens are not used in industrial radiography?

• Lead

• Fluorescent

• Silver halide

• All of the above

The film processing step in which the undeveloped silver bromide is removed from the film emulsion is called:

• Development

• Stop bath

• Fixing

• Rinsing

A radiation producing device which emits radiation of one or a few discreet wavelengths is:

• An X ray machine

• A linear accelerator

• A gamma ray source

• A betatron

Radiography of tubular sections using a double wall, double viewing technique is mainly applicable to sections:

• Over 38 mm in diameter

• 88 mm in diameter or less

• 125 mm in diameter and less

• Under 25 mm in diameter

Most scattered radiation which adversely affects the radiographic image quality originates:

• From floors and walls adjacent to the test piece

• From other nearby objects

• From the test piece itself

• From the lead intensifying screens

An effect of scattered radiation is to:

• Decrease required exposure time

• Diminish contrast, detail and clarity of radiographic image

• Decrease film density

• All of the above

What is the most important factor in determining the archival quality of radiographic film?

• Film density

• Image quality

• Degree of removal of fixer residues during washing

• Degree of removal of developer residues during washing

The main advantage of having small focal spot on an X ray tube is:

• Heat is conducted away more efficiently than with a large focal spot

• A smaller focal spot is unlikely to be damaged from the required tube currents

• Longer tube life

• A smaller focal spot allows sharper radiographic images than does a larger focal spot

Cobalt-60 is produced by:

• Fission of Uranium-235

• Neutron capture by Cobalt-59

• Radioactive decay

• None of the above

The difference in densities seen on a radiograph due to section changes in an item is:

• Film contrast

• Radiographic contrast

• Subject contrast

• Radiographic sensitivity