Chapter 12 Flashcards Preview

Fundamentals Radiography 2 > Chapter 12 > Flashcards

Flashcards in Chapter 12 Deck (25):
1

What are the two basic components of radiographic film?

the base and emulsion

2

The main purpose of the gelatin emulsion in radiographic film is to hold what?

silver halide crystals

3

Crystals in film emulsion consist of two things?

Silver bromide and Silver iodide

4

The overcoat on radiographic film is a protective covering of what?

Gelatin

5

Latent image formation occurs during what?

film exposure

6

A contaminant in the silver halide crystal creates the what?

Sensitivity speck

7

The latent image can be seen only after what?

development

8

Photon interaction free the electrons form bromide and iodide atoms in the what?

Silver halide crystal

9

The latent image is made up of what atoms?

Silver

10

Photon interactions in the emulsion occur with exposure to what two things?

X-rays and light

11

High contrast film contains smaller silver halide crystals of what size?

uniform

12

Film is made with double emulsion to enhance the film what?

Speed

13

The layer of screen that lies closest to the film is what?

the protective coating

14

The light-emitting efficiency of the intensifying screen is improved by the what?

reflective layer

15

Screen characteristics are determined by the size of the phosphor crystals, thickness, of the phosphor layer and what?

Phosphor composition

16

A phosphorescent material emits light for a period of time after what?

stimulation

17

An intensifying screen is an example of what two things?

luminescence and fluorescence

18

Luminescent material emits light after its outer shell electrons are what?

excited

19

A screen that emits light after an exposure terminates is exhibiting screen what?

lag

20

The intensification factor is a measurement of screen what?

speed

21

The intensification factor is exposure required without screens divided by the what required with screens?

exposure

22

The intensification factor increases with increased what?

kvp

23

The ability of an intensifying screen absorb x-rays is called?

detective quantum efficiency

24

image noise increased with increased what?

conversion efficiency (CE)

25

Both the isotropic emission of light from screen phosphor crystals and the added reflective layer contribute to what blur?

image