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CWB Welding Inspector Lvl 2 > Chapter 10 Radiographic Inspection > Flashcards

Chapter 10 Radiographic Inspection Flashcards

1
Q
  1. X-rays are a type of electromagnetic wave but gamma rays are beams of tiny charged particles.

a. True
b. False

A

b. False

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2
Q
  1. List three disadvantages of radiography over other inspection methods.
A

Bulky equipment,
special safety precautions,
some defects not reliably detected

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3
Q
  1. Sketch the main components of an X-ray machine then compare your sketch with that shown in Figure 137.
A
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4
Q
  1. Do gamma rays generally have a greater or lesser ability to penetrate thick steel than X-rays?
A

Greater

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5
Q
  1. List three disadvantages of gamma rays over X-ray radiography?
A

Radiation emitted continuously
Radiation hazard
Penetration power cannot be adjusted

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6
Q
  1. For a given intensity of X-rays striking a specimen, what are the two main factors that affect the intensity that emerges from the specimen to strike the film?
A

Thickness and type of material

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7
Q
  1. The only thing that causes fuzziness at the edge of an image is geometric unsharpness.

a. True
b. False

A

False, fuzziness is also caused by inherent unsharpness and scattering

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8
Q
  1. List the three dimensions that affect geometric unsharpness and the relationship among them (Ug=Ft/d equation).
A

Source size,
F; object-to-source distanced;
thickness, t, Ug = Ft/d

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9
Q
  1. What is the simplest way of reducing the geometrical unsharpness for a given plate and X-ray machine?
A

Increase the object (plate)-to-source distance

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10
Q
  1. The purpose of the IQI is to verify that all defects greater than 286 of the plate thickness have been detected.

a. True
b. False

A

b. False

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11
Q
  1. What features of the IQI image must be clearly distinguished on the radiograph when using X-ray?
A

Outline of the IQI and the essential T size hole or wire diameter

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12
Q
  1. Some dark crack-like indications appear on a radiograph. If they are not due to cracks in the actual specimen what else could they result from?
A

Scratches or cracks in the lead intensifying screens

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13
Q
  1. What is the specified range of density of a radiograph according to most codes?
A

1.5 to 3.5

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14
Q
  1. Since radiography is a volumetric method the condition of the surface is not an important factor.

a. True
b. False

A

b. False

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15
Q
  1. How would you distinguish spatter from porosity on a radiograph?
A

Spatter appears white or light and may cover the base metal as well as the weld. Porosity is normally confined to the weld metal and appears dark

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16
Q
  1. Radiography is not recommended by CSA W59 for fillet welds.

a. True
b. False

A

a. True

17
Q
  1. Give two reasons why the source is not always placed inside cylinders or pipes when radiographing welds.
A

There may not be access to the inside; it may not be possible to get adequate source-to-film distance inside.

18
Q
  1. How many shots would be required to radiograph a splice weld in a rectangular hollow structural section where there is no access to the inside?
A

Four

19
Q
  1. Good visual inspection should always be used in conjunction with radiography.

a. True
b. False

A

a. True

20
Q
  1. What is the recommended delay after welding before doing radiography on high restraint joints (according to CSA W59)?
A

48 Hours

21
Q
  1. If a product is to be stress relieved, why is it important to use exactly the same procedure for radiography after stress relief as is used before?
A

To prevent borderline indications that could be interpreted differently before and after stress relief

22
Q
  1. According to CSA W59, when doing spot radiography what minimum length of weld must each spot show?

a. 50 mm
b. 100 mm
c. 200 mm

A

b. 100 mm

23
Q
  1. What do the letters CGSB stand for?
A

Canadian General Standards Board

24
Q
  1. List some of the items you would look for when checking a procedure for radiography.
A 
Some would be a sketch, 
governing standards, 
equipment, 
type of source, 
geometric arrangement, 
source-to-film distance, 
type of film and 
processing
25
Q
  1. Which organization in Canada controls the use of gamma ray devices?
A

Canadian Nuclear Safety Commission (CNSC)

26
Q
  1. Sketch from memory the international radiation hazard sign (trefoil), then compare your sketch with that in Figure 191.
A
27
Q
  1. The emission of gamma rays from a radioactive isotope cannot be switched off; the source can only be retracted into a shielding container.

a. True
b. False

A

a. True

28
Q
  1. If 1000 rays strike a shielding plate that is twice the TVL thick, how many rays emerge on the other side?
A

10

29
Q
  1. If point B is 4 times as far from a radiation source as point A, how much lower will the intensity of radiation be at point B than point A?
A

16 times lower

30
Q
  1. What is the SI equivalent unit to rem?
A

Sievert (Sv)

CWB Welding Inspector Lvl 2 (13 decks)

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