A densitometer is an instrument for measuring:

Although there may be other reasons for using calcium tungstate screens in industrial radiography, they are most usually used to:

A penetrameter is used to indicate the:

The purpose of agitating an X-ray film during development is to:

The activity of the developer solution is maintained stable by:

For best results when manually processing film, solutions should be maintained within a temperature range of:

Film badges and pocket dosimeters are called:

A betatron, a resonant-transformer, and an electrostatic generator are examples of:

The radioactive isotope is inside the storage pig when the light is illuminated.

The _________ light is illuminated when the source is fully extended to the end of the cable.

An excellent radiograph is obtained under given exposure conditions with a tube current of 5 mA and an exposure time of 12 minutes. If other conditions are not changed, what exposure time would be required if the X-ray tube current could be raised to 10 mA?

An excellent radiograph is obtained under given conditions of exposure with the film located at a distance of 91 cm (36 in.) from the target of the X-ray tube. If the film is now placed only 46 cm (18 in.) from the target, and all exposure conditions except time are held constant, the new exposure time will be:

Which dose would be dangerous, if not fatal, if applied to the entire body in a short period of time?

If an exposure time of 60 seconds was necessary using a 1.2 m (4ft) source-to-film distance for a particular exposure, what time would be necessary if a 0.6 m (2 ft) source-to-film distance is used and all other variables remain the same?

Assuming that a good radiograph is obtained at a setting of 10 mA in 40 s, how much time will be necessary to obtain one equivalent radiograph if the milliamperage is changed to 5 mA (all other conditions remaining constant)?

Why is Co-60 used as radiation source for medium-weight metals of thickness ranges from 38 mm to 229 mm

(1.5 in. to 9 in.)?

In making an isotope exposure in an unshielded area, you find the dose rate 1.8 m (6 ft) from the source is 1 200 mR/h. What would be the dose rate at 7.3 m (24 ft)?

Approximately, what percent of the original radioactivity is left after 6 half-lives?

Which of the following list concrete, lead and steel in order of their effectiveness in providing shielding against radiation?

An unshielded isotope source gives a dosage rate of 900 mR/h at 3 m (10 ft). What would the unshielded dosage rate be at 9 m (30 ft)?