Non-Destructive Testing (NDT) Study Guide & Core Inspection Methods Revision
Notes
how are non-destructive test methods different than mechanical test methods like tensile or
impact testing? - correct answer ✔✔mechanical test methods are used for qualification or
random sampling only because they must destroy a portion of welded assembly to provide
results
non-destructive methods on the other hand provide assessment of weld quality without
altering or damaging the specimen being tested
explain how a radiograph of a weld is interpreted and how most affects appear - correct answer
✔✔radiation turns the film dark the most radiation that gets through the darker the film the
dark lines represent radiation has passed through Slag inclusions instead of metal edges of root
pass
what are two main types of radiation sources used for radiography - correct answer ✔✔x-rays
come- from a high-voltage electrical camera
gamma rays- come from a radio active isotope an example of iridium
what are two main advantages of using x-ray machines instead of gamma-ray sources for
radiography? - correct answer ✔✔x-rays machines can have their power adjusted to match the
thickness of metal being inspected
safer because the radiation source is turned off electrically
is a limitation of x-ray machine in comparison to a gamma ray source - correct answer ✔✔the
radiation from the X-ray camera is first in One Direction and requires electricity
, a camera camera does not require electricity so it is portable and is capable of panoramic
exposures for piping and boiler welds
what is adjusted on the x-ray machine to radiograph different thicknesses or materials - correct
answer ✔✔to radiograph bigger material the voltage applied to the X-ray camera is increased
and will cause a decrease in x-ray wavelength and more penetrating power for thicker material
what is a gamma ray source how are People Protected from its ionizing radiation - correct
answer ✔✔-its a resource for radiography is an unstable isotope that gives off radiation as it
decays
-when not in use the radio active capsule is round back in side a special containment camera
- lined with LEaD or depleted uranium radiation
-is monitored with a geiger counter
name two most commonly used gamma-ray sources and identify which one would be used for
testing thicker materials - correct answer ✔✔i r i d i u m and Cobalt
Cobalt is used to testicular metals
what two criteria measure the quality of a radiograph and What factors contribute to the clarity
of the image - correct answer ✔✔they are of suitable quality based on
contrast
definition
what are factors affecting radiograph quality - correct answer ✔✔a small source of radiation
a long source of film distance
a short film to specimen distance
Notes
how are non-destructive test methods different than mechanical test methods like tensile or
impact testing? - correct answer ✔✔mechanical test methods are used for qualification or
random sampling only because they must destroy a portion of welded assembly to provide
results
non-destructive methods on the other hand provide assessment of weld quality without
altering or damaging the specimen being tested
explain how a radiograph of a weld is interpreted and how most affects appear - correct answer
✔✔radiation turns the film dark the most radiation that gets through the darker the film the
dark lines represent radiation has passed through Slag inclusions instead of metal edges of root
pass
what are two main types of radiation sources used for radiography - correct answer ✔✔x-rays
come- from a high-voltage electrical camera
gamma rays- come from a radio active isotope an example of iridium
what are two main advantages of using x-ray machines instead of gamma-ray sources for
radiography? - correct answer ✔✔x-rays machines can have their power adjusted to match the
thickness of metal being inspected
safer because the radiation source is turned off electrically
is a limitation of x-ray machine in comparison to a gamma ray source - correct answer ✔✔the
radiation from the X-ray camera is first in One Direction and requires electricity
, a camera camera does not require electricity so it is portable and is capable of panoramic
exposures for piping and boiler welds
what is adjusted on the x-ray machine to radiograph different thicknesses or materials - correct
answer ✔✔to radiograph bigger material the voltage applied to the X-ray camera is increased
and will cause a decrease in x-ray wavelength and more penetrating power for thicker material
what is a gamma ray source how are People Protected from its ionizing radiation - correct
answer ✔✔-its a resource for radiography is an unstable isotope that gives off radiation as it
decays
-when not in use the radio active capsule is round back in side a special containment camera
- lined with LEaD or depleted uranium radiation
-is monitored with a geiger counter
name two most commonly used gamma-ray sources and identify which one would be used for
testing thicker materials - correct answer ✔✔i r i d i u m and Cobalt
Cobalt is used to testicular metals
what two criteria measure the quality of a radiograph and What factors contribute to the clarity
of the image - correct answer ✔✔they are of suitable quality based on
contrast
definition
what are factors affecting radiograph quality - correct answer ✔✔a small source of radiation
a long source of film distance
a short film to specimen distance
