Theory

Question 1

Term given for time take for milky appearance to disappear when processing

Answer 1

Clearing time

Question 2

Which things may help to reduce diffraction mottling

Answer 2

Lead screens, off setting the beam and higher kv

Question 3

Another term used to describe parallex technique

Answer 3

Tube shift method

Question 4

Penumbra is correct term for ?

Answer 4

Geometric unsharpness

Question 5

Why is a duplex iqi used

Answer 5

Indicate definition

Question 6

When using x rays whys a filter used

Answer 6

To remove low energy radiation

Question 7

Which will affect inherent unsharpness

Answer 7

Kv

Question 8

The law of reciprocity links exposure in ma and…

Answer 8

Time

Question 9

If fluorescent screens were used instead of lead what effect would this have

Answer 9

Decreased expose and decreased definition

Question 10

Lead screens are often used above 120kv why?

Answer 10

To intensify the beam by emitting electrons

Question 11

Filters used in the primary beam from an x ray set have what effect?

Answer 11

Increase the average energy and decrease contrast

Question 12

In electric arc welding a metal rod is one electrode the other is?

Answer 12

The work material

Question 13

Which could occur in parent plate because of welding?

Answer 13

Lamella tear + haz crack

Question 14

Where gas is used as a shield for the welding process the gas is commonly?

Answer 14

Argon helium and hydrogen

Question 15

Which welding process takes place in a vaccum ?

Answer 15

Electron beam welding

Question 16

When welding thin plate material which process would be used

Answer 16

Tig or mig

Question 17

In regard to atomic number which will be larger

Answer 17

Mass number

Question 18

A change in the number of protons in an atoms nucleus will result in

Answer 18

The atom becoming a different element

Question 19

What are the 3 main forms of attenuation in regards to x and y radiation

Answer 19

Photoelectic effect, pair production and compton effect

Question 20

The term bremsstrahlung refers to

Answer 20

The primary radiation produced by slowing of a high speed electron bu the positive field around the nucleus of an atom

Question 21

Describe beta decay

Answer 21

A neutron in the nucleus breaks into a proton and an electron the electron is emitted from the nucleus

Question 22

What maintains the structure of an aton

Answer 22

Binding energy

Question 23

Atoms and sub atomic atoms carrying either a positive or negative charge are called

Answer 23

Ions

Question 24

Film contrast is affected by what?

Answer 24

Film speed

Question 25

The intensity of x rays produced is governed by ?

Answer 25

The current applied to the cathode

Question 26

The atomic number of an atom is the number of

Answer 26

Protons

Question 27

For an atom to be electrically neutral there must be an equal number of protons and ???

Answer 27

Electrons

Question 28

What has a half life of 74 days

Answer 28

Iridium 192

Question 29

Energy of an x ray set is measured in?

Answer 29

Kv or mv

Question 30

Which word describes the clarity or sharpness or image

Answer 30

Definition

Question 31

SI unit for activity ?

Answer 31

Becquerels

Question 32

A small focal spot will ?

Answer 32

Reduce geometric unsharpness

Question 33

Radiation is measured in ?

Answer 33

Mev or kev