In fluoroscopic testing, a fundamental difficulty is the relative low brightness level of the images. One method for increasing brightness utilizes one of the following which converts light energy from the initial phosphor surface to electrons which are accelerated and focused onto smaller fluorescent screen.

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

A general rule governing the application of the geometric principles of shadow formation states that the:

The uneven distribution of developed grains within the emulsion of a processed X-ray film causes the subjective impression of:

Co-60 is reported to have a half-life of 5.3 years. By how much should exposure time be increased (over that used initially to produce excellent radiographs when the Co-60 source was new) when the source is two years old?

The final selection of the voltage to use to radiograph any specimen depends on _________________.

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

The general method of producing X-rays involves the sudden deceleration of high velocity electrons in a solid body called a:

Which of the following isotopes has the longest half-life?

The slope of a straight line joining two points of a specified densities on a characteristic curve of a film is known as:

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:

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

The range of thickness over which densities are obtained that are satisfactory for interpretation is a measure of the;

The amount of unsharpness or blurring of a radiograph is:

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

As the effective energy of the radiation increases up to about 250 kV:

Low voltage X-ray tubes are generally fitted with windows made of:

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:

In general, the quality of fluoroscopic equipment is best determined:

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

In certain cases, it may advantageous to pack lead shot around a specimen. the purpose for doing this is to:

The developer solution is:

In the microradiographic technique:

Which of the following X-ray generators would produce the narrowest cone of X-radiation?

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

The quantitative measure of film blackening is referred to as:

A curve that relates density with the logarithm of exposure or of relative exposure is called:

A special radiographic method requiring two radiographs taken during separate exposures from two different positions to give the visual impression of a three-dimensional display when viewed in an optical device simultaneously is called:

The slope (steepness) of a characteristic curve is a measure of:

Discontinuities caused by fatigue and/or corrosion are categorized as:

Heat affected zone cracking is not easily detected with radiographic testing because:

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

The energy level of X-rays is controlled by the:

The specific activity of a gamma ray source is important because it determines:

The earliest indications of radiation damage may be detected in the:

Generally speaking, artifacts that occur before the film is exposed are:

Subject contrast is affected by:

The pocket dosimeter has the advantage of:

The factor equation is:

To compute the change in exposure that is required by a change in source-to-film distance, we would use the equation: