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• Venkatesan Rajalingam

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12/31/2019

Radiography 35 Question Quiz

Radiography 35 Question Quiz ~ First name ~

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1

X-rays and Gamma rays have significant penetrating power due to their: Short wavelength Medium wavelength Long wavelength Wide range of wavelengths

2

X-rays and Gamma rays are a form of: Light Particle radiation Electromagnetic radiation Both B and C

3

Who is given credit for the discovery of radioactive materials? Henri Becquerel Wilhelm Roentgen Marie Curie Pierre Curie

4

Higher energy radiation will have more: Speed Incident Intensity Penetrating power Both B and C

5

The amount of geometric unsharpness in a radiograph is affected by: The source to film distance The source to object distance The size of the source All of the above

6

Which two types of radiation-matter interactions account for the majority of attenuation in typical industrial radiography? Compton Scattering and photoelectric absorption Compton Scattering and pair production Pair production and photoelectric absorption None of the above

7

X-rays and Gamma rays are often referred to as photons because: They possess a charge They have mass They occur as small packets of energy None of the above X-ray generators produce radiation through:

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Radiography 35 Question Quiz

8

Bremsstrahlung processes K-shell emmission processes Radioactive decay Both A and B

9

Bremsstrahlung production of X-rays produces radiation that is composed of: A small number of very defined energies A continuous spectrum of energies over some range Radiation of only one energy None of the above

10

Newtons Inverse Square Law is useful in radiography because it indicates how the radiation intensity is affected by: Radioactive decay Distance from the source The size of the source None of the above

11

The thickness of any given material where 50% of the incident energy has been attenuated is known as the: Half-value layer Linear attenuation coefficient Decay rate Mass attenuation coefficient

12

Which of the following is not a strength of radiographic inspection? It is not limited to material type It can be used to inspect assembled components It can detect surface and subsurface features Access to both side of the test sample is required

13

The number of X-ray or Gamma photons that are transmitted through a material depends on the: Energy of the photons Thickness of the material Atomic number of the material All of the above

14

Undercut is the loss of resolution at a sharp, thickness transition area due to: Scattering within the part Backscatter Sidescatter Scattering within the film

15

A radiograph made with an exposure of 8 mAm produces a density of 1.8. The sensitometric curve shows a difference in relative exposure between a density of 1.8 and the target density of 2.5 is

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Radiography 35 Question Quiz

4. What must the new exposure time be to produce a radiograph with a density of 2.5? 4 mAminutes 2 mAminutes 32 mAminutes None of the above

16

There are four types of radiation-matter interactions that can contribute to the total attenuation. These are: Compton scattering, pair production, photoelectric absorption, rayleigh scattering Compton scattering, electron exchange, photoelectric absorption, rayleigh scattering Electron exchange, pair production, photoelectric absorption, rayleigh scattering None of the above

17

Manmade sources of radioactive sources are produced by: By splitting the nucleus of atoms in the source material Adding electrons to the source material Introducing an extra neutron to the atoms of the source material None of the above

18

When penetrating radiation is directed at a material, the radiation intensity decreases: Decreases exponentially with increasing material thickness Increase linearly with increasing material thickness Decrease linearly with increasing material thickness None of the above

19

Collimators are used to: Reduce the radiation beam spread Filter the radiation beam Increase film latitude Decrease film latitude

20

The target of an X-ray tube is often made out of tungsten becuase: It has a high atomic mass which will result in more X-rays being generated due to atomic particle interactions It is an inexpensive material that is easy to machine It have very high thermal conductivity which makes it easy to cool None of the above

21

Film contrast is determined by: The type of film used The process by which the film was developed The radiation energy used Both A and B

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Radiography 35 Question Quiz

22

The rate at which a radioactive isotope changes to a more stable atom is know as the: Isotope decay rate Half-life Activity Attenuation

23

On a film radiograph, an area of high density in the test component will appear: Lighter than the surrounding area Darker than the surrounding area More defined than the surrounding area Less defined than the sorrounding area

24

The drive cable of a gamma ray exposure device (camera) allows the radiographer to: Turn on and shut off the gamma rays from a safe distance Adjust the position of the camera from a safe distance Move the source in and out of the camera while maintaining a safe distance None of the above

25

Who is given credit for the discovery of X-ray? Henri Becquerel Wilhelm Roentgen Marie Curie Pierre Curie

26

Ionizing radiation can be used in industrial radiography because the health hazards: Have been eliminated with controls and procedures Are minimized through controls and procedures Are worth the risk Are being ignored

27

Exposure to ionizing radiation can be limited: With the use of shielding By increasing distance form the source By limiting the time exposed to the radiaiton All of the above

28

Image quality indicators (IQIs) provide information about the level of: Resolution and contrast sensitivity Resolution and film latitude Contrast sensitivity and latitude Contrast sensitivity only

29

X-rays and Gamma rays present a health risk because they are a form of ionizing radiation, which means that the radiation has

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Radiography 35 Question Quiz

enough energy to: Vibrate water molecules and generate heat Break chemical bonds Break physical bonds None of the above

30

After traveling through two half-value layers, the incident radiation has been reduced to: 50% 35% 20% None of the above

31

Two of the more common industrial Gamma-ray sources are: Cobalt-60 and iridium-192 Cobalt-60 and plutonium-240 Plutonium-240 and uranium-222 Iridium-192 and Lead-102

32

X-rays and Gamma rays: Always travel in a straight line Can be influenced by an electrical field Can be influenced by a magnetic field None of the above

33

Stationary lab or shop X-ray systems usually rely on what to limit exposure to the radiation?� Distance controls Time limits Shielding All of the above

34

Attenuation of radiation is due to: Absorption Scattering Radioactive decay Both A and B

35

Radiation beam filters are sometime used in X-ray radiography to: Remove some of the low energy radiation to increase definition To remove some of the low energy radiation to increase contrast sensitivity Remove some of the low energy radiation to reduce definition Both A and B

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