Take A Free ASNT NDT NR Level 1 Exam Practice Test – Quiz Course

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Here you can take the free ASNT NDT NR Level 1 Exam Practice Test with the latest Neutron Radiographic Testing Method Questions and Answers

1.

Neutron penetration is greatest in which of the following materials?

 
 
 
 

2.

In general, by increasing the neutron energy from a neutron radiographic source:

 
 
 
 

3.

The time required for one-half of the atoms in a particular sample of radioactive material to disintegrate is called:

 
 
 
 

4.

Generally, the attenuation of neutrons by a given material is:

 
 
 
 

5.

The mass absorption coefficients for thermal neutrons when plotted against regularly increasing atomic numbers of periodic elements present a:

 
 
 
 

6.

Many of the absorption differences between neutrons and X-rays indicate clearly that the two techniques:

 
 
 
 

7.

The neutron cross section is the term normally used to denote:

 
 
 
 

8.

The sharpness of the outline in the image of the radiograph is a measure of:

 
 
 
 

9.

The highest quality direct neutron radiographs obtainable today use:

 
 
 
 

10.

When doing neutron radiography on radioactive materials, the materials are best handled:

 
 
 
 

11.

Gadolinium conversion screens are usually mounted in rigid holders called:

 
 
 
 

12.

The best high-intensity source of thermal neutrons is:

 
 
 
 

13.

Scattered radiation caused by any material, such as a wall or floor, on the film side of the specimen, is referred to as:

 
 
 
 

14.

What has the highest thermal neutron absorption cross section?

 
 
 
 

15.

Conversion screens are used in neutron radiography:

 
 
 
 

16.

A curie is an equivalent of:

 
 
 
 

17.

Short wavelength electromagnetic radiation produced during the disintegration of nuclei of radioactive substances is called:

 
 
 
 

18.

A photographic record produced by the passage of neutrons through a specimen onto a film is called:

 
 
 
 

19.

Possible reactions that can occur when a fast neutron strikes a nucleus are:

 
 
 
 

20.

For inspection of radioactive objects or those that emit gamma radiation when bombarded with neutrons, a preferable detection method is the:

 
 
 
 

21.

Materials that are exposed to thermal neutron beams:

 
 
 
 

22.

Hydrogenous material has a :

 
 
 
 

23.

The penetrating ability of a thermal neutron beam is governed by:

 
 
 
 

24.

A graph showing the relationship between film optical density and exposure is called:

 
 
 
 

25.

The three main steps in processing a radiograph are:

 
 
 
 

26.

Radiographic contrast in a neutron radiograph is least affected by:

 
 
 
 

27.

Higher resolution can be achieved in direct neutron radiography by:

 
 
 
 

28.

The main reason for using neutron radiography in place of X-radiography is:

 
 
 
 

29.

The best material for mounting specimens for neutron radiographic inspection is:

 
 
 
 

30.

Which of the following materials is best for making identification labels when using the neutron radiographic process?

 
 
 
 

31.

As a check on the adequacy of the neutron radiographic technique, it is customary to place a standard test piece on the source side of the cassette. This standard test piece is called:

 
 
 
 

32.

A densitometer is:

 
 
 
 

33.

The ability to detect a small discontinuity or flaw is called:

 
 
 
 

34.

Movement, geometry, and screen contact are three factors that affect radiographic:

 
 
 
 

35.

The difference between the densities of two areas of a radiographic film is called:

 
 
 
 

36.

The selection of the proper type of film to be used for neutron radiographic examination of a particular part depends on the:

 
 
 
 

37.

When radiographing a part that contains a large crack, the crack will appear on the radiograph as:

 
 
 
 

38.

Radiographic sensitivity, in the context of defining the minimum detectable flaw, depends on:

 
 
 
 

39.

An Image Quality Indicator is used to measure the:

 
 
 
 

40.

Unwanted inclusions in a part will appear on a radiograph as:

 
 
 
 

41.

A sheet of cadmium with an opening cut in the shape of the part to be radiographed may be used to decrease the effect of scattered neutrons, which undercuts the specimens. Such a device is called a:

 
 
 
 

42.

The accidental movement of the specimen or film during exposure or the use of a source-film that is too small will:

 
 
 
 

43.

Dysprosium conversion screens emit:

 
 
 
 

44.

Materials in common usage for moderation of fast neutron sources include:

 
 
 
 

45.

In the converter screen technique, the neutron image is produced by alpha, beta, or gamma radiation and it is thereby:

 
 
 
 

46.

Converter screen material characterized by lithium, boron, and gadolinium has little tendency to become radioactive but does:

 
 
 
 

47.

Gadolinium is frequently employed as a neutron absorber because of its:

 
 
 
 

48.

An excellent radiograph is obtained under given exposure conditions with a thermal neutron flux of 2 x 10% n/cm2-s for 10 minutes. If other conditions are not changed, what exposure time would be required if the neutron flux was lowered to 1 x 106 n/cm2-s?

 
 
 
 

49.

Neutron converter screens should be inspected for flaws or dirt:

 
 
 
 

50.

The primary advantage of using a Cf-252 source for neutron radiography is its:

 
 
 
 

51.

Neutron beams used in nondestructive testing normally contain:

 
 
 
 

52.

In neutron radiography, L/D refers to the:

 
 
 
 

53.

A type of neutron beam collimator is a:

 
 
 
 

54.

Commonly used converter screens are:

 
 
 
 

55.

In order to decrease geometric unsharpness:

 
 
 
 

56.

High-resolution gadolinium conversion screens are produced by:

 
 
 
 

57.

In order to increase the neutron beam intensity:

 
 
 
 

58.

Neutron exposure may be due to:

 
 
 
 

59.

Gadolinium conversion screens emit:

 
 
 
 

60.

Which elements are commonly used in the indirect transfer method?

 
 
 
 

61.

Which element is commonly used for direct neutron radiography?

 
 
 
 

62.

Neutron sensitive scintillators provide:

 
 
 
 

63.

Lead is:

 
 
 
 

64.

Neutron energy, exposure time, and film type are three important neutron radiographic parameters that can be controlled. What other parameters can be controlled?

 
 
 
 

65.

The purpose of vacuum cassettes is to:

 
 
 
 

66.

In making a californium isotope exposure in an unshielded area, you find the dose rate of 1.9 m (6 ft) from the source is 1 200 mR/h. What would be the dose rate at 7.3 m (24 ft)?

 
 
 
 

67.

In developing film by hand technique without agitation:

 
 
 
 

68.

Film developed by automatic processors:

 
 
 
 

69.

The emulsion side of a single-coated photographic X-ray-type film used for neutron radiography can be detected in the darkroom using standard safe lights as the:

 
 
 
 

70.

The purpose of film containers is to:

 
 
 
 

71.

The two most common causes for excessively high density radiographs are:

 
 
 
 

72.

Single-emulsion high-resolution X-ray film is very good for neutron radiography because:

 
 
 
 

73.

Which of the following materials is suited for construction of vessels or pails used to mix processing solutions?

 
 
 
 

74.

Excessive exposure of film to light prior to development of the film will most likely result in:

 
 
 
 

75.

White crescent-shaped marks on an exposed X-ray film are most likely caused by:

 
 
 
 

76.

Reticulation resulting in a puckered or netlike film surface is probably caused by:

 
 
 
 

77.

Frilling or loosening of the emulsion from the base of the film is most likely caused by:

 
 
 
 

78.

When the minute silver grains, on which the X-ray film image is formed, group together in relatively large masses, they produce a visual impression called:

 
 
 
 

79.

Static marks, which are black tree-like or circular marks on a radiograph, are often caused by:

 
 
 
 

80.

The purpose of agitating an X-ray film during development is to:

 
 
 
 

81.

When manually processing films, the purpose of tapping the hangers sharply two or three times after the films have been lowered into the developer is to:

 
 
 
 

82.

The decrease in the activity of the developer solution is compensated by:

 
 
 
 

83.

The purpose of fixation is to:

 
 
 
 

84.

For the best results when manually processing film, solutions should be maintained within the temperature range of:

 
 
 
 

85.

Water spots on films can be minimized by:

 
 
 
 

86.

The most suitable films for producing neutron radiography are:

 
 
 
 

87.

The normal development time for manually processing X-ray film is:

 
 
 
 

88.

A properly exposed radiograph that is developed in a solution at a temperature of 58 °F will be:

 
 
 
 

89.

An advantage of the fountain-pen type of ionization chamber used to monitor radiation received by personnel is that:

 
 
 
 

90.

What radiation dose would be dangerous, if not fatal, if applied to the entire body in a short period of time?

 
 
 
 

91.

The average thermal neutron flux that gives a dose of 100 mrem in 40 hours is:

 
 
 
 

92.

When working with a neutron radiography facility, the radiation expected is:

 
 
 
 

93.

The intensity of neutron radiation is usually measured in:

 
 
 
 

94.

What does the term (R/h) refer to when speaking of intensity?

 
 
 
 

95.

Small amounts of exposure to neutrons or gamma rays:

 
 
 
 

96.

Overexposure to neutron or gamma rays may cause damage to human:

 
 
 
 

97.

A general rule used to define an excessive amount of radiation exposure is:

 
 
 
 

98.

A primary disadvantage of the fountain-pen type of ionization chamber used to measure the amount received by personnel is the:

 
 
 
 

99.

The exposure of personnel to X- and gamma radiation can be determined by means of:

 
 
 
 

100.

Divergent neutron beams:

 
 
 
 

101.

The intensity of gamma rays is measured in the:

 
 
 
 

102.

A radioactive source used for neutron radiography is:

 
 
 
 

103.

The half-life of Cf-252 is:

 
 
 
 

104.

Cf-252 is:

 
 
 
 

105.

A normally desirable feature of a thermal neutron beam for neutron radiography is:

 
 
 
 

106.

To achieve uniformity in neutron radiographs, it is recommended that:

 
 
 
 

107.

The approximate energy of a thermal neutron is:

 
 
 
 

108.

The material that slows down neutrons is called:

 
 
 
 

109.

A good moderating material is:

 
 
 
 

110.

If the temperature decreases, the energy of a thermal neutron will:

 
 
 
 

111.

A main disadvantage of gadolinium screens is:

 
 
 
 

112.

The main advantage of a divergent beam collimator is:

 
 
 
 

113.

The main disadvantage of a divergent beam collimator is:

 
 
 
 

114.

The definition of a neutron is:

 
 
 
 

115.

To an Operational Health Physicist, the abbreviation, RBE means:

 
 
 
 

116.

The cross-section is expressed in area units, the most common being the one that is equal to 1024 cm2. This is the:

 
 
 
 

117.

The transfer exposure method is used because:

 
 
 
 

118.

Which of the following elements has the largest mass absorption coefficient for thermal neutrons? 

 
 
 
 

119.

The term “macroscopic cross-section Σ is synonymous with the:

 
 
 
 

Question 1 of 119

Take A Free ASNT NDT NR Level 1 Exam Practice Test – Quiz Course
Take A Free ASNT NDT NR Level 1 Exam Practice Test – Quiz Course

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In this quiz course, we are covering all the topics listed below:

  • NDT Handbook: Volume 3, Radiographic Testing (144, 144CD, 144WCD)
    ASM Handbook Vol. 17, NDE and QC (105)
    Supplement to Recommended Practice No. SNT-TC-1A (Q&A Book) – Neutron Radiographic Testing Method

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