RT LEVEL I AND II STUDY QUESTIONS

Question 1

Three basic principles to minimize radiation exposure are:

Answer 1

Time, distance, and shielding

Question 2

When using exponents, 106 would equal:

Answer 2

1,000,000 = 1 mega (M)

Question 3

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

Answer 3

16

Question 4

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

Answer 4

3

Question 5

Which of the following can a radiographic trainee preform?

Answer 5

Process and sort X-ray film.

Question 6

Which of the following is an advantage of radiographic testing?

Answer 6

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

Question 7

Radiographic testing images are typically:

Answer 7

Digital images or film images.

Question 8

1*10-3 would be equal to:

Answer 8

0.001

Question 9

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

Answer 9

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

Question 10

Advantages of radiographic testing include:

Answer 10

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

Question 11

Which of the following can radiographic testing reveal?

Answer 11

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

Question 12

The spontaneous decay process “radioactivity” was discovered by:

Answer 12

Marie Curie.

Question 13

Who accidentally discovered X-rays in 1895?

Answer 13

Röntgen.

Question 14

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

Answer 14

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

Question 15

What is the main difference between qualification and certification?

Answer 15

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

Question 16

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

Answer 16

X-rays and gamma rays.

Question 17

The activity of a gamma ray source is measured in:

Answer 17

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

Question 18

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

Answer 18

600 kV

Question 19

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

Answer 19

Nature of the source.

Question 20

A half-life is the time it takes for:

Answer 20

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

Question 21

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

Answer 21

148.6 days.

Question 22

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

Answer 22

Iridium-192

Question 23

Which of the following are ionization processes?

Answer 23

Photoelectric effect, compton effect, and pair production.

Question 24

The specific activity of a radioactive isotope depends on the:

Answer 24

Time the material has been in the reactor

Question 25

Some radioisotopes have more than one:

Answer 25

MeV energy level that is emitted

Question 26

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?

Answer 26

Compton effect

Question 27

Gamma rays are generated by which of the following?

Answer 27

Radioactive isotopes undergoing disintegration.

Question 28

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

Answer 28

Negatively charged neutrons

Question 29

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:

Answer 29

Curie

Question 30

The major component of scatter is:

Answer 30

Medium-energy rays weakened in the compton scattering process.

Question 31

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?

Answer 31

Source with higher specific activity.

Question 32

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

Answer 32

Gamma rays, beta particles, and alpha particles.

Question 33

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

Answer 33

1.02 MeV

Question 34

The following radioactive isotope is produced in nuclear fission:

Answer 34

Cs-137

Question 35

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

Answer 35

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

Question 36

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

Answer 36

Pair production.

Question 37

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

Answer 37

Mass number

Question 38

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?

Answer 38

Photoelectric absorption

Question 39

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

Answer 39

Increase the wavelength.

Question 40

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

Answer 40

Colbalt-60

Question 41

Gamma ray intensity is:

Answer 41

A measure of radiation emission

Question 42

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

Answer 42

Lithium fluoride

Question 43

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

Answer 43

Roentgen (R)

Question 44

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

Answer 44

2 mR/h or 0.02 mSv/h

Question 45

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

Answer 45

Geiger-müller counter

Question 46

Three ways of minimizing radiation exposure are:

Answer 46

Time, distance, shielding

Question 47

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

Answer 47

Sieverts

Question 48

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

Answer 48

Area alarm system

Question 49

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

Answer 49

Area alarm system

Question 50

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

Answer 50

Living cells

Question 51

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

Answer 51

The unit measurement of radiation absorption by humans

Question 52

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

Answer 52

Gamma radiation cannot be shut off

Question 53

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?

Answer 53

60 min

Question 54

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

Answer 54

400 mSv

Question 55

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

Answer 55

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

Question 56

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

Answer 56

37 x 109 Bq or 37 GBq

Question 57

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:

Answer 57

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

Question 58

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

Answer 58

15 rem

Question 59

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

Answer 59

Radium

Question 60

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

Answer 60

Wood

Question 61

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?

Answer 61

At least 1

Question 62

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

Answer 62

NRC

Question 63

A Sievert is:

Answer 63

An SI unit of equivalent does or effective does.