Chapter Ten Quiz Flashcards
Gamma rays generally have a greater ability to penetrate thick steel than X-rays.
True
Which of the following are some items you would look for when checking a procedure for radiography?
Type of source, geometric arrangement and source to film distance.
The only thing that causes fuzziness at the edge of an image is geometric unsharpness.
False
The emission of gamma rays from a radioactive isotope cannot be switched off; the source can only be retracted into a shielding container.
True
Which of the following are disadvantages of gamma rays over X-ray radiography? Select all that apply:
Radiation emitted continuously and radioisotope requires replacement.
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? Select the two options that are correct:
Type and thickness of material
Which of the following are disadvantages of radiography over other inspection methods? Select all that apply:
Some defects not reliably detected, requires special safety precautions and is bulky.
Give two reasons why the source is not always placed inside cylinders or pipes when radiographing welds. Select the two correct options.
may not be access and not enough source to film distance inside
If point B is 4 times as far from a radiation source as point A, the intensity of radiation will be
times lower at point B than point A.
16 times
Question 10 options:
The recommended delay after welding before doing radiography on high restraint joints is
hours (according to CSA W59).
48
Question 11 options:
According to most codes, the specified range of density of a radiograph has a minimum value of
and an upper value of
1.5 to 3.5
Good visual inspection should always be used in conjunction with radiography.
True
Since radiography is a volumetric method the condition of the surface is not an important factor.
False
What features of the IQI image must be clearly distinguished on the radiograph when using X-ray? Select all that apply:
Shadows, outline of IqI and essential t hole or wire diameter.
Consider the following equation. Ug= Ft/d what are they
Ug= unsharpness, F= source size, d= object to source distance, and t= oject to film distance.
X-rays are a type of electromagnetic wave, but gamma rays are beams of tiny charged particles.
False
Question 17 options:
When making a radiograph of a splice weld in a rectangular hollow structural section where there is no access to the inside,
shots would be required.
4 shots
Radiography is not recommended by CSA W59 for fillet welds.
true
The purpose of the IQI is to verify that all defects greater than 2% of the plate thickness have been detected .
false
Question 20 options:
If 1000 rays strike a shielding plate that has a thickness twice the TVL, then
rays emerge on the other side.
10
Which organization in Canada controls the use of gamma ray devices?
Canadian nuclear safety commission
How would you distinguish spatter from porosity on a radiograph? Select the correct statements.
Porosity is normally confined to the weld metal and appears dark.
What do the letters CGSB stand for?
canadian general standards board
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?
Prevent borderline indications that could be interpreted differently before and after stress relief.
