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RAD SAF-UT-VT-RT > RT LEVEL I AND II STUDY QUESTIONS > Flashcards

RT LEVEL I AND II STUDY QUESTIONS Flashcards

1
Q

Three basic principles to minimize radiation exposure are:

A

Time, distance, and shielding

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2
Q

When using exponents, 106 would equal:

A

1,000,000 = 1 mega (M)

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3
Q

If you have a base number of 4 with an exponent of 2, the resultant number is:

A

16

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4
Q

How many different levels of qualification currently exist in the radiographic testing industry?

A

3

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5
Q

Which of the following can a radiographic trainee preform?

A

Process and sort X-ray film.

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6
Q

Which of the following is an advantage of radiographic testing?

A

Can reveal discontinuities open to the surface and can reveal discontinuities within the material.

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7
Q

Radiographic testing images are typically:

A

Digital images or film images.

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8
Q

1*10-3 would be equal to:

A

0.001

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9
Q

Radiography is used to test which of the following variety of products?

A

Castings, forgings, welds, and aerospace components for cracks, foreign material, and water in honeycomb.

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10
Q

Advantages of radiographic testing include:

A

Can be used on most materials and can reveal discontinuities in all products.

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11
Q

Which of the following can radiographic testing reveal?

A

Structural discontinuities, mechanical failures, assembly errors, and fabrication errors.

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12
Q

The spontaneous decay process “radioactivity” was discovered by:

A

Marie Curie.

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13
Q

Who accidentally discovered X-rays in 1895?

A

Röntgen.

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14
Q

Radiographic testing uses X-ray and gamma ray sources that generate great amounts of radiation

A

Damage to cells of living tissue, which is a health hazard

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15
Q

What is the main difference between qualification and certification?

A

Qualification is the process that should take place before a person becomes certified.

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16
Q

What are the most common forms of radiation used to date to test a variety of products in various
industries?

A

X-rays and gamma rays.

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17
Q

The activity of a gamma ray source is measured in:

A

Curies in the U.S. system and becquerels in the SI system

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18
Q

The energy of the gamma radiation beam from Ir-192 is equivalent to an X-ray machine using:

A

600 kV

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19
Q

The energy of a gamma ray source is determined by the:’

A

Nature of the source.

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20
Q

A half-life is the time it takes for:

A

The activity of an isotope to decay to one-half of its initial strength.

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21
Q

A 100 Ci iridium-192 source would decay to 25 Ci in how many days if not used?

A

148.6 days.

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22
Q

Which isotope has a gamma ray energy of0.3 to 0.6 MeV?

A

Iridium-192

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23
Q

Which of the following are ionization processes?

A

Photoelectric effect, compton effect, and pair production.

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24
Q

The specific activity of a radioactive isotope depends on the:

A

Time the material has been in the reactor

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25
Q

Some radioisotopes have more than one:

A

MeV energy level that is emitted

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26
Q

What term refers to the interaction of a photon with orbital electrons when the photon energy is not
completely lost to an electron and the rest of the energy gets scattered?

A

Compton effect

27
Q

Gamma rays are generated by which of the following?

A

Radioactive isotopes undergoing disintegration.

28
Q

A typical atom generally consists of all of the following except:

A

Negatively charged neutrons

29
Q

The most widely used standard (imperial) unit of measurement for measuring the rate at which the
output of a gamma ray source decays is the:

A

Curie

30
Q

The major component of scatter is:

A

Medium-energy rays weakened in the compton scattering process.

31
Q

Which of the following sources can produce a radiograph with the same sharpness with a smaller
source-to-film distance (SFD) if the source strength is the same?

A

Source with higher specific activity.

32
Q

Natural and artificial radioisotopes disintegrate by releasing energy in the following forms:

A

Gamma rays, beta particles, and alpha particles.

33
Q

The minimum amount of energy required to produce pair production is approximately:

A

1.02 MeV

34
Q

The following radioactive isotope is produced in nuclear fission:

A

Cs-137

35
Q

Which of the following aspects of a gamma ray source is comparable to the focal spot in an
X-ray tube?

A

Surface area of the material or source as viewed from the test object

36
Q

In which of the following interactions of gamma rays with matter is the electromagnetic radiation
converted into mass?

A

Pair production.

37
Q

A gamma ray source is designated as iridium-192. The 192 designation is the:

A

Mass number

38
Q

Which of the following ionization processes of X- or gamma rays is more likely with a low-energy
photon and material with a high atomic number?

A

Photoelectric absorption

39
Q

The scattering process of X-rays or gamma radiation will:

A

Increase the wavelength.

40
Q

Which of the gamma ray sources listed below has an energy greater than 1 million electronvolts?

A

Colbalt-60

41
Q

Gamma ray intensity is:

A

A measure of radiation emission

42
Q

Which is the most common material used in the manufacture of TLDs?

A

Lithium fluoride

43
Q

The unit of measure used for exposure to radiation in air that produces 1 esu is the:
Non-functional Question - Please Edit

A

Roentgen (R)

44
Q

What is the maximum radiation level permitted in an unrestricted area?

A

2 mR/h or 0.02 mSv/h

45
Q

Which of the following radiation survey meters will give a false zero or saturate in a high radiation
area?

A

Geiger-müller counter

46
Q

Three ways of minimizing radiation exposure are:

A

Time, distance, shielding

47
Q

Roentgen equivalent mammal or man (rem) in the International System of Units is expressed in:

A

Sieverts

48
Q

Which of the following radiation monitoring systems is required when preforming X-rays in a
shielded exposure booth?

A

Area alarm system

49
Q

Which of the following radiation monitoring systems is required when preforming X-rays in a
shielded exposure booth?

A

Area alarm system

50
Q

Radiation safety is very important when working with gamma and x-ray sources because it can
cause damage to

A

Living cells

51
Q

The definition of a radiation absorbed dose (rad) is:

A

The unit measurement of radiation absorption by humans

52
Q

Gamma sources have one major safety concern that X-ray units don’t, which is

A

Gamma radiation cannot be shut off

53
Q

The radiation level at a location is 6 mR/h (60 μSv/h). If a person is allowed a maximum dose of 60
μSv, how long may he or she stay there?

A

60 min

54
Q

A dose of 2 rad of alpha particles is absorbed by human tissue. The equivalent does received by the
tissue is:

A

400 mSv

55
Q

Which of the following instruments does not measure total dose but rather dose rate?

A

Survey meter (ionization chamber) Survey meter (ionization chamber)Survey meter (ionization chamber)

56
Q

A curie is equal to how many Becquerel (Bq)?

A

37 x 109 Bq or 37 GBq

57
Q

When preforming radiographic testing, a person who is not part of the radiographic team but a
member of the general public should not receive a dose of radiation more than:

A

2 mrem in any 1 hour or in excess of 100 mrem in 1 year

58
Q

For a radiation operator, the annual dose limit allowed for the lens of the eye is:

A

15 rem

59
Q

A curie is the original unit of radioactivity described as the radiation emitted by one gram of:

A

Radium

60
Q

Which of the following materials is not commonly used for shielding radiographers from daily
exposures?

A

Wood

61
Q

How many survey meters are required to be present on a job site per radiation source, unluess
otherwise stated in an individula’s operating and emergency (O%E) procedures manual?

A

At least 1

62
Q

Which agency regulates handling and storage of radioisotopes in the U.S.?

A

NRC

63
Q

A Sievert is:

A

An SI unit of equivalent does or effective does.

RAD SAF-UT-VT-RT (5 decks)

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