Radiography RT Flashcards Preview

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Flashcards in Radiography RT Deck (22):
1

When the minute silver grains on which the x-ray film image is formed group together in a relatively large glasses, they produce a visual impression called

Graininess

2

A curie is the equivalent of

37 GBq

3

Very short wavelength electromagnetic radiation produced when electrons traveling at high speed collide with matter is called

X radiation

4

Short wavelength electromagnetic radiation produced during the disintegration of the nuclei of radioactive substances is called

Gamma radiation

5

A sheet of lead with an opening cut in the shape of the part to be radiographed maybe used to decrease the effect of scattered radiation which undercuts the specimens. Such a device is called

Mask

6

The density difference between to selected portions of the radiograph is known as

Radiographic contrast

7

The sharpness of the outline in the image of the radiograph is a measure of

Radiographic definition

8

To neutralize the developer and stop the developing process is the purpose of the

Stop bath

9

A thin metallic sheet such as brass,copper,lead, etc. placed at the source to reduce the effects of softer radiation is known as

Filter

10

Degree of film blackening on a radiographic image is the

Density

11

To produce x-rays, electrons are accelerated to a high velocity by an electrical field and then suddenly stopped by a collision with a solid body. This body is called

Target

12

The term used to describe the loss of excess energy by the nucleus of radioactive atoms is called

Decay (disintegration)

13

The term used to express the number of curies of radioactivity per gram per ounce of source weight is

Specific activity

14

To remove all the undeveloped silver salts of the emulsion, to leave the developed silver as a permanent image, and to harden the gelatin is the function of the

Fixing

15

Penetrating ability of an x-ray beam is governed by

Kilovoltage

16

The small area in the x-ray tube from which the radiation emanates is called the

Focal spot

17

The range of specimen thickness that can be adequately recorded on the radiograph is called

Latitude

18

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

Betatron

19

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

Characteristic curve

20

A qualitative term often used to indicate the size of the smallest detail that can be seen in a radiograph is

Radiographic sensitivity

21

The slope (steepness) of a characteristic logarithm of exposure or of relative curve is a measure of

Radiographic contrast

22

A special radiographic method requiring to 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

Stereoradiography