Besides serving as a filter, screens of high atomic numbers, such as lead and lead antimony, also:

Improper geometric factors, poor contact between film and lead foil screens, and graininess of film are possible causes of:

A larger physical size source may produce an equivalent quality radiograph if:

A device which is basically a combination of magnet and transformer designed to guide and accelerate electrons in a circular orbit to very high energies is called a:

The load that can be handled by an X-ray tube focal spot is governed by:

Two serious obstacles to high-intensity fluoroscopy are:

A dark crescent shaped spot, clearly in the base metal adjacent to a weld would probably be:

The velocity of electrons striking the target in an X-ray tube is a function of the:

The absorption of gamma rays from a given source when passing through matter depends on the:

Undercut' and 'burned out' edges of the test piece film image are caused by:

Which of the following instruments would exhibit the best sensitivity and most likely to be used to detect small leaks in a radiation barrier?

Two factors which greatly affect the suitability of the target material in an X-ray tube are:

A gas-filled region located in an electrical field created by electrodes across which a potential difference is applied forms the major portion of:

If it were necessary to radiograph a 18 centimetre (7 inch) thick steel product, which of the following gamma ray sources would most likely be used?

The absorption of radiation by a material varies:

Which of the following statements should be true to acheive the highest level of radiographic sharpness (definition)?

The basic purpose of a penetrameter is to:

The reason the exposure time must be increased by a factor of four when the source-to-film distance is doubles is that:

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

The inherent filtration of an X-ray tube is a function of the:

The quantity of radiation which will produce, by means of ionization, one electrostatic unit of electricity is 0.001293 gram of dry air is known as a:

The activity of the fixer diminishes after being used for a period of time because of the:

To produce the sharpest image, which of the following should be true?

A source of Iridium-192, whose half-life is 75 days, provides an optimum exposure of a given test object today in a period of 20 minutes. Five months from now, what exposure time would be required for the same radiographic density, under similar exposure conditions?

Of the following, the source providing the most penetrating radiation is: