Technique, Physics Flashcards
Lead foil screens are used in radiography:
☑️To improve the quality of the radiograph by preferentially reducing the effect of scatter radiation
☑️To reduce the exposure time
The sharpness of the outline in the image of the radiograph is a measure of:
Radiographic Definition
If a piece of lead 1/2-inch this is placed in the path of a beam of radiation emanating from cobalt-60, it will reduce the dose rate at a given location by:
One half
Two X-ray machines operating at the same nominal kilovoltage and milliamperage settings:
May give not only different intensities but also different qualities of radiation
If a fluorescent screen is accidentally exposed to unattenuated X-rays, which of the following occurs:
The screen is essentially undamaged
Movement, geometry, and screen contact are three factors that affect radiographic:
Unsharpness
An ______ is a charged part of an atom that can have either a +/- charge
Ion
When doing gamma-ray radiography with high-intensity emitters, the sources are best handled:
By remote handling equipment
A graph showing (logarithmic scale) the relation between material thickness, kilovoltage, and exposure time is called:
Exposure chart
Atoms that have the same atomic number but different atomic mass number.
Isotopes
The addition or removal of electrons is called.
Electrification
Atoms that have the same atomic number and the same atomic mass number.
Isomers
The force that keeps an electron in orbit.
Centripetal force
) It is the quantity of matter described by its energy equivalence.
Mass
The unit of the quantity of radioactive material.
Curie
Energy emitted and transferred through space.
Radiation
By using a___________ transformer, the incoming voltage can be adjusted in order to heat the filament of an x-ray tube; is about ________volts
Step Down, 10-12 volts
Which meter registers indicating x-ray exposure?
Milliamp meter
Which of the following applies to the filament transformer?
A step down transformer is needed
The purpose of the circuit breaker is to
Prevent overloading
The source of electrons is the
Cathode, filament
The positive end of the tube is referred to as the
Anode, focal spot
The most sensitive cells to ionizing radiation are
Reproductive cells
The best type of xray to penetrate body tissue is
Hard rays, short wavelengths