Radiographic Testing Vocabulary

Front 1

Absorbed dose

Back 1

"rad" 1 rad=0.01 j/kg. SI unit is "gray" 1 gray = 1 j/kg.

Front 2

Absorption

Back 2

Process whereby the INCIDENT particles or PHOTONS of radiation are reduced in number or energy as they pass through matter.

Front 3

Acute radiation syndrome

Back 3

Immediate effects of a short term, whole body overexposure of a person to ionizing radiation. These effects include NAUSEA, VOMITING, malaise, increased temperature, and blood changes.

Front 4

Alpha partical

Back 4

Positively charged particle emitted by certain RADIO-NUCLIDES. It consists of two protons and two neutrons, and is identical to the nucleus of a helium atom.

Front 5

Anode

Back 5

POSITIVE ELECTRODE of a discharge tube. In an X-ray tube, the anode carries the target.

Front 6

Area of interest

Back 6

The SPECIFIC PORTION of the object image in the RADIOGRAPH that is to be evaluated.

Front 7

Artifact

Back 7

Spurious indication on a radiograph arising from, but not limited to, FAULTY MANUFACTURING, STORAGE, HANDLING, EXPOSURE, OR PROCESSING.

Front 8

Attenuation (X-ray)

Back 8

Reduction of RADIATION BEAM INTENSITY caused by the interactions of the beam with the matter through which it passes.

Front 9

Back scattered radiation

Back 9

Radiation which is scattered MORE THAN 90 DEGREES with respect to the incident beam that is backward in general direction of the radiation source.

Front 10

Blocking or masking

Back 10

SURROUNDING SPECIMEN or covering their sections with absorptive material.

Front 11

Compton scatter radiation

Back 11

The scattered X-ray or gamma ray which results from the INELASTIC SCATTERING of an incident X-ray or gamma ray on an electron.

Front 12

Contrast sensitivity

Back 12

Measure of MINIMUM PERCENTAGE change in an object which produces a perceptible density/brightness change in the radiological image.

Front 13

Definition, image definition

Back 13

SHARPNESS of DELINEATION of image details in a radiograph.

Front 14

Densitometer

Back 14

DEVICE for measuring the optical density of radiograph film.

Front 15

Film density

Back 15

Quantitative measure of diffuse optical light transmission (optical density, blackening) through a developed film.

Front 16

Film speed

Back 16

Numerical value expressing the response of an image receptor to the energy of penetrating radiation under specified condition.

Front 17

Filter

Back 17

UNIFORM layer of material, usually of higher atomic number than the specimen, placed between the radiation source and the film for the purpose of preferentially absorbing the SOFTER RADIATIONS.

Front 18

Focal spot

Back 18

For x-ray GENERATORS, that area of anode (target) of an X-ray tube which emits x-ray when bombarded with electrons.

Front 19

Fog

Back 19

A

B

C

D

E

F

G

H

Longest question

Front 20

Geometric unsharpness

Back 20

PENUMBRAL SHADOW in radiological image which is dependent upon 1) the radiation source dimensions, 2) source to object distance, and 3) object to detector distance.