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Radiography Interpretation > Questions I Got Wrong > Flashcards

Questions I Got Wrong Flashcards

1
Q 
When an A particle is EMITTED the atomic mass changes by ?
A-zero
B -minus 4
C-plus 4
D-minus 2
A

B-minus 4

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2
Q 
When a B particle is EMITTED the atomic NUMBER changes by 
A-minus 1
B-Zero 
C-minus 2
D-plus 2
A

D-plus 2

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3
Q 
When an A particle is Emitted the atomic NUMBER changes by,
A-zero
B-minus 4 
C-minus 2
D-plus 2
A

C-minus 2

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4
Q 
In X-Ray radiation,  intensity is proportionate to .....
A-tube current 
B-tube voltage
C-filament current 
D-Source to focus to film Distance
A

A-tube current

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5
Q

The supply of electrons , tube filament is increased by …..

A-increasing the Tube voltage
B-increasing the filament current.

A

B- Filament current

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6
Q

The factors that determine effective or projective focus size in an X ray tube are :-

A- The diameter of the berylium window and the diameter of the tungsten target.
B- diameter of the electron beam and the angle of the tungsten target with respect to electron beam .
C- the diameter of the Berylium window and the tungsten target with respect to the window
D- The diameter of the electron beam and the diameter of the tungsten target.

A

B - Diameter of the Electron beam and the angle of the tungsten target with respect to the electron beam .

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7
Q

An electron …..

A

Carries an electric charge that is equal and opposite to that of a proton.

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8
Q

A beta particle is a high velocity ……

A-neutron
B-helium nucleus
C-electron
D-proton

A

C- Electron

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9
Q

Compared to X Rays are Gamma rays ,, light ..

A-has longer wavelength and lower Frequency
B-has lower wavelength and higher frequency
C-has shorter wavelength and lower frequency
D-Travels faster

A

A- Has longer wavelength and higher frequency.

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10
Q 
Fixing time should be ..
A- 4 minutes 
B- twice  the clearing time 
C- 2 minutes
D- Equal to Dev time
A

B - Twice the clearing time

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11
Q

Salt or flouro metallic screens have a coating containing ….

A-Sodium iodide
B-Silver Bromide
C-Calcium Tungstate
D-Zinc Sulphide

A

C-Calcium Tungstate

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12
Q

Scratches on a LEAD screen will produce :-

A-Dark images on the film
B-Light images on a film
D-Sometimes B , usually A

A

D - Sometimes B , Usualy A

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13
Q

Inherent Unsharpness will INCREASE if :-

A- a fine grain instead of an Ultra fine grain film is used.
B-The radiation source is changed from iridium 192 and COBOLT 60
C-The effective physical side to the radiation is increased .
D-Both A and B

A

D- Both A and B

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14
Q

Duplex IQI’s are used to :-

A- Measure Unsharpness
B- measure rad sensitivity
C- measure effective source size
D- to measure contrast.

A

A-To measure Unsharpness

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15
Q

Radiographic contrast will be reduced if :-

A- Film density is increased from 2.0 to 2.5
B- A fine grain film is substituted with an ultrafine grain film.
C- The source to film distance is decreased.
D- The base fog level of the rad film is increased.

A

D- The base fog level of the rad film is increased

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16
Q

Average grain size of a fine grain film is :-

A

1 Micron

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17
Q

The main ingredient of Developer is :-

A-Oxidizing agent
B-Reducing agent
C-Acid
D-None of the above

A

B-Reducing agent

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18
Q

Lead screen decreases exposure time by :-

A- A factor of 10 or 12 at radiation energies exceeding 120 Kv
B- A factor of 5 or 6 at radiation energies exceeding 120 Kv
C- A factor of 4 or 5 at radiation energies exceeding 120 Kv
D- A factor of 2 or 3 at radiation energies exceeding 120 Kv

A

D- A factor of 2 or 3 at radiation energies exceeding 120 Kv

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19
Q

At the same tube voltage , the radiation produced by a constant potential X Ray unit compared with that produced by a similar self rectified unit is :-

A- Softer
B- The same
C- Double
D- Harder

A

D-Harder

20
Q

When a B particle is EMITTED , the Atomic MASS changes by:-

A-Zero
B- Plus 1
C- Minus 1
D- Minus 2

A

A-Zero

21
Q

If the transmitted light intensity through part of a radiography that has a density of 2.0 is 90 candela per square meter ( cd/m2) How much light will be transmitted at a location where the film density is 3.0 if all other factors stay the same ?

A- 30 cd/m2
B- 9 cd/m2
C- 0.9 cd/m2
D- 60 cd/m2

A

B- 9 cd/m2

22
Q

An exposure chart for Iridium 192 that has been constructed for SFD=500mm gives an exposure of 100 ci- min for 25mm of steel . The spec calls for a minimum SFD = 800mm. If all factors remain equal , what exposure is needed at the specified minimum SFD?

A- 160 Ci-min
B- 62.5 Ci min
C- 39.1 Ci min
D-256 Ci min

A

D- 256 Ci-mi

23
Q

With which type of intensifying screen is the main intensifying effect due to the emission of secondary electrons….

A- Salt Screens
B-Flurometalic
C-Lead Screens
D-All of the above

A

C - Lead Screen

24
Q

The nucleus of any Atom other than hydrogen contains :-

A-Protons and electrons
B-Neutrons and Protons
C-Protons , Neutrons and Electrons
D-Alpha , Beta and Gamma particles.

A

B- Protons and Neutrons

25
Q

Crimping a film - Lead screen combination before exposure typically causes :-

A- Dark crescent shaped film marks
B-Light crescent shaped film marks

A

B - Light crescent shaped film marks

26
Q

The Major cause of scatter up to a radiation energy of 0.6 MEV IS ?

A- Photo electric effect
B- Pair production

A

A-Photoelectric effect

27
Q

The major cause of scatter ABOVE 6 MeV is ….

A- Photo electric
B- Pair production

A

B - Pair Production

28
Q

Calculate geometric Unsharpness for single wall single image photography of a weld in 60mm thick steel plate for an effective source size of 3mm and a source to film distance of 720mm.

A-0.25mm
B-0.30mm
C-0.24mm
D-0.27mm

A

D-0.27mm

29
Q

In the photo electric effect ,the X Ray photon :-

A- Transferes all of its energy to an orbital electron with the remainder continuing as a lower energy X Ray photon

B- Transferes all its energy to an orbital electron
C- Transferes all its energy to an atomic nucleus amusing the emission of a Beta particle
D- converts to an electron :- Positron pair .

A

B - Transfers all its energy to an orbital electron

30
Q

The Si unit of absorbed dose is the

A- Bequerel
B- Sievert
C- Grey
D-Roetengen

A

C-Grey

31
Q

A good radiography is produced with an exposure of 25mA mins at a focus to film distance (FFD) of 400mm . If the FFD is increased to 850mm and all the other factors remain equal , the exposure required to produce a good radiograph will be :-

A-100mA mins
B-113mA mins
C-53 mA mins
D-91 mA mins

A

B-113 mA mins

32
Q

As Gamma radiation passes through an absorber , there is a reduction in radiation intensity. The mathematical relationship between absorber thickness and transmitted intensity is :-

A- Exponential
B- parabolic
C-Linear
D-sinosoidal

A

A- Exponensial

33
Q

If the effective focus size = 4mm, The OFD = 35mm and the FFD = 750mm ,,,,,,What is the geometric Unsharpness that has been obtained ?

A-0.196 mm
B-0.200 mm
C-0.125 mm
D-0.187 mm

A

A-0.196mm

34
Q

In X Ray radiography , which of the following factors does not affect half value thickness?

A - Kilovoltage ( tube voltage )
B- Type of material
C- miliamperage ( tube current )
D- none of the above

A

C- Mili amperage

35
Q

Relative movement , exposure geometry, type of film , type intensifying screens , screen contact and film development all have an effect on :-

A- definition
B- contrast
C- both A and B
D- Exposure time

A

A-definition

36
Q

He output of a gamma ray isotope is :-

A - The total amount of radiation emitted in 10 half lives .
B - The dose rate per Currie at one meter from the source.
C - The dose rate at one meter from the source.
D - The total amount of radiation emitted in one half life

A

B- The dose rate per Currie at one meter from the source

37
Q

Film contrast depends on :-

A - The type of film , film density , type of developer , development time and the Dev temperature .
B - X Ray Kilovoltage
C - Material
D - All of the above

A

A

38
Q

An alternative to the terminology ‘ inherent Unsharpness ‘ is :-

A - Penumbra
B - film Unsharpness
C - geometric Unsharpness
D- all of the above

A

B - Film Unsharpness

39
Q

Subject contrast is not affected by :-

A - X Ray Kilovoltage
B - Type of material
C - Scatter
D - Type of film

A

D - Type of Film

40
Q 
How many neutrons in a helium nucleus?
A-4
B-1
C-3
D-2
A

D-2

41
Q

If the specified maximum geometric Unsharpness is 0.25mm and the effective source dimension is 2.3mm , what minimum source to film distance is required for SWSI radiography of a 45mm thick butt weld in flat plate?

A- 414mm
B-459mm
C-503mm
D-519mm

A

B- 459mm

don’t forget to add the 45mm on to the 414mm

42
Q

A Radiographic technique, using an exposure of 10mAmin, produces a film density of 1.5 , where a film density of 2.3 is required. A film characteristic curve is available which gives a LOGERITHMIC relative value of 1.2 for ( density = 1.5) with a corresponding value of 1.8 for ( density=2.3 ). Thus the acceptable minimum film density should be achieved with an exposure of:

A-33.33 mAmin
B-15.17 mAmin
C-40.00mAmin
D-20.00mAmin

A

C-40.00 mAmin

43
Q

BSEN 462-1 specifies wire type IQIs covering a total of how many material groups?

A-2: Fe,Al
B-4:Fe,Al,Cu,Ti
C-4,Fe,Al,Cu,Ni
D-6:Fe,Al,Cu,Ti,Ni,Zn

A

B-4:Fe,Al,Cu,Ti

    FACT!!!
44
Q

The minimum length of a wire element in an IQI IS :

A-10mm
B-25mm
C-30mm
D-40mm

A

A-10mm

45
Q

For unexposed film ,,,, BSEN 1763-1 specifies a maximum fog density of:

A- Zero
B-0.1
C-0.2
D-0.3

A

D-0.3

46
Q

3 properties of the radiation used for NDE radiography are:

A-Flourecence , ionisation , penetration
B-Penetration, chemical effect, fluorescence
C- penetration , chemical effect, travels in straight lines
D- chemical effect , ionisation , travels in straight lines
C-

A

C - penetration , chemical effect , travels in straight lines.

47
Q

The radiation spectrum produced by an X Ray source is

A - continuous —all wavelengths represented over a wide range
B -Discrete — made up of several specific wavelengths
C- either a or b
D- none of the above

A

A- continuous ,, all wavelengths represented over a wide range

Radiography Interpretation (10 decks)

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