NR Level 1 :: Neutron Radiographic Testing MCQ's Part-2 | Quiz Practice for ASNT/NDT Exam Questions

Non-Destructive Testing: Total 120′ Questions for Conduct of Examinations at NDT NR Level-1. (Quiz Part-1 60′ Part-2 60′.).

Neutron Radiographic Level -1 (NR) General Examination Part-2

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NR Level 1 ASNT / NDT Test 2. This is a quiz over the various topics covered throughout the Neutron Radiographic Testing Level 1 section to test your understanding. Click “below button ‘or ‘Scroll down” to start your test.

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NR Level 1 :: NDT Neutron Radiographic MCQ’s Part-2

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

a) scattering and radiative capture.

b) micro-shrinkage and static charges caused by friction

c) sudden temperature change and film contrast

d) uniform thickness and filtered radiation

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

a) the inverse square law

b) a curie

c) a half-life.

d) the exposure time

What has the highest thermal neutron absorption cross section?

a) gold

b) Indium

c) gadolinium.

d) dysprosium

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

a) X-radiation

b) gamma radiation.

c) scatter radiation

d) back-scattered radiation

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

a) portability.

b) low cost per unit neutron flux compared to other

c) high-resolution neutron radiographic sources

d) long useful life without source quality degradation

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

a) a dark, intermittent, or continuous line.

b) a light irregular line

c) either a dark or light line

d) a fogged area on the radiograph

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In neutron radiography, L/D refers to the:

a) limiting neutron energy divided by the neutron density

b) largest neutron flux in the system divided by the beam diameter

c) distance from the neutron source to the object divided by the source diameter.

d) distance from the neutron source to the picture divided by the beam diameter

Gadolinium conversion screens are usually mounted in rigid holders called:

a) film racks

b) cassettes.

c) emulsifiers

d) diaphragms

The highest quality direct neutron radiographs obtainable today use:

a) imaging screens using lithium-zinc sulfide as the imaging materials

b) high-speed radiographic films

c) dysprosium as an imaging screen

d) gadolinium as an imaging screen.

10.

The best high-intensity source of thermal neutrons is:

a) a Cf-252 source

b) an accelerator

c) a nuclear reactor.

d) a Cf-252 source plus a multiplier

11.

In order to decrease geometric unsharpness:

a) neutrons should proceed from as small a source as other considerations will allow.

b) neutrons should proceed from as large a source as other considerations will allow

c) the film should be as far as possible from the object being radiographed

d) the distance from the source to the material examined should be as small as practical

12.

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

a) aluminum

b) brass

c) cadmium or gadolinium.

d) lead

13.

In order to increase the neutron beam intensity:

a) the L/D could be lowered.

b) the neutron energy must be increased

c) the test specimen should be moved further from the film

d) a smaller source size could be used

14.

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

a) blurred picture

b) regularly increasing picture

c) random picture.

d) dark picture

15.

A curie is an equivalent of:

a) 0.001 mCi

b) 1 000 mCi.

c) 1 000 MCi

d) 100 MCi

16.

Neutron converter screens should be inspected for flaws or dirt:

a) daily

b) each time they are used.

c) occasionally

d) when flaws are detected on the radiograph

17.

An Image Quality Indicator is used to measure the:

a) size of discontinuities in a part

b) density of the film

c) the amount of film contrast

d) quality of the radiographic technique.

18.

A densitometer is:

a) a meter used to measure neutron intensity

b) an instrument used to measure film density.

c) a meter used to measure the density of a material

d) a meter used to measure gamma content

19.

The three main steps in processing a radiograph are:

a) developing, frilling, and fixation

b) developing, fixation, and washing.

c) exposure, developing, and fixation

d) developing, reticulation, and fixation

20.

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

a) the graininess of the film

b) the unsharpness of the flawed image in the film

c) the contrast of the flawed image in the film

d) all of the above.

21.

Which elements are commonly used in the indirect transfer method?

a) gadolinium and cadmium

b) rhodium and samarium

c) dysprosium and indium.

d) cadmium and dysprosium

22.

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

a) greater neutron penetration is achieved.

b) greater neutron radiographic contrast can be obtained

c) radiographic exposure time can be reduced

d) resolution can be increased

23.

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:

a) a reference plate

b) a lead screen

c) a penetrameter

d) an image quality detector.

24.

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

a) contrast

b) unsharpness.

c) reticulation

d) density

25.

Hydrogenous material has a :

a) high macroscopic scattering cross-section.

b) high absorption cross section

c) high microscopic absorption cross section

d) low microscopic scattering cross-section

26.

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

a) aluminum, magnesium, and tin

b) water, plastic, paraffin, and graphite.

c) neon, argon, and xenon

d) tungsten, cesium, antimony, and columbium

27.

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Higher resolution can be achieved in direct neutron radiography by:

a) placing lead intensifying screen between a gadolinium screen and film

b) increasing the L/D ratio of the collimation system.

c) increasing the exposure time

d) increasing the distance between the object and the film cassette

28.

Dysprosium conversion screens emit:

a) low-energy betas and gammas

b) high-energy betas, low-energy gammas, and internal conversion.

c) beta particles only electrons

d) low-energy gamma rays only

29.

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

a) lower cost

b) higher resolution in all cases

c) the ability to image objects and materials not possible with X-rays.

d) simpler radiographic procedure required than X-radiography

30.

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

a) a fluoroscopic image

b) a radiograph.

c) an isotopic reproduction

d) none of the above

31.

Neutron exposure may be due to:

a) the direct beam from the neutron source

b) scatter radiation arising from objects in the direct beam

c) both a and b.

d) neither a nor b

32.

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

a) subject contrast

b) radiographic definition.

c) radiographic contrast

d) film contrast

33.

Conversion screens are used in neutron radiography:

a) to convert neutron energy into ionizing radiation.

b) to increase the exposure time

c) both a and b are reasons for using conversion screens

d) neither a nor b is a reason for using conversion screens

34.

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

a) radiographic contrast

b) radiographic sensitivity.

c) radiographic density

d) radiographic resolution

35.

Materials that are exposed to thermal neutron beams:

a) must not be handled for at least 3 minutes after exposure has ceased

b) must be stored in a lead-lined room

c) may be radioactive after exposure to neutrons has ceased.

d) should be monitored by means of a neutron counter

36.

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

a) primary scattering

b) undercut

c) reflected scattering

d) back-scattered radiation.

37.

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

a) a dark spot

b) a light spot

c) a generalized gray area of varying contrast

d) either a dark or a light spot or area depending on the relative absorption ratio of the part material and the inclusion material.

38.

Gadolinium conversion screens emit:

a) gamma rays and conversion electrons.

b) beta particles only

c) alpha particles and positrons

d) gamma rays only

39.

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

a) directly by personnel equipped with special protective clothing

b) by remote handling equipment.

c) directly by personnel with special protective clothing except when radiographs are being made

d) by the same methods used for nonradioactive materials

40.

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

a) attenuation characteristics of the material being penetrated.

b) time

c) source-to-film distance

d) all of the above

41.

High-resolution gadolinium conversion screens are produced by:

a) flame spray techniques

b) being grown in large flat crystals

c) vacuum vapor deposition.

d) large brazing systems

42.

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

a) radiographic contrast.

b) subject contrast

c) film contrast

d) definition

43.

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

a) a bar chart

b) a characteristic curve.

c) an exposure chart

d) a logarithmic chart

44.

A type of neutron beam collimator is a:

a) mean free path diaphragm

b) divergent beam collimator.

c) poly cellular field generator

d) neutron beam catcher

45.

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

a) cause radiation problems

b) complement each other.

c) increase exposure speed

d) fog radiographic film

46.

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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:

a) mask.

b) filter

c) back-scatter absorber

d) lead-foil screen

47.

Neutron beams used in nondestructive testing normally contain:

a) alpha particles

b) positrons

c) gamma rays and neutrons.

d) X-rays

48.

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

a) direct exposure method

b) transfer method.

c) isotopic reproduction method

d) electrostatic-belt generator method

49.

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

a) the danger in handling radioactive material

b) the absorbing power of material for neutrons.

c) the atomic number of neutron reactor material

d) radiation detection equipment

50.

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?

a) 5 minutes

b) 10 minutes

c) 20 minutes.

d) 30 minutes

51.

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

a) thickness of the part

b) material of the specimen

c) neutron energy

d) none of the above.

52.

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

a) used to measure neutron beam divergence

b) externally cooled during the process

c) photographically more detectable than the unconverted neutron image.

d) an important factor for determining Young’s modulus of the material

53.

Commonly used converter screens are:

a) gadolinium, dysprosium, and indium.

b) neodymium, plutonium, and technetium

c) gadolinium, lead, and indium

d) gold, silver, and cadmium

54.

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

a) reported to the Atomic Energy Commission

b) greater for fast neutrons than thermal neutrons.

c) an indication of the quality of the X-radiographic technique

d) appreciably greater for thermal and epithermal neutrons than for fast neutrons.

55.

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

a) protect the radiographic film from excessive pressure

b) recharge the focal point size of the neutron source

c) filter and collimate the excess neutrons

d) emit radiation immediately upon the absorption of a neutron.

56.

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

a) extremely low cost

b) high neutron absorption for a given thickness.

c) an ability to absorb gamma rays

d) ability to diffract alpha particles

57.

Radiographic contrast in a neutron radiograph is least affected by:

a) developer temperature

b) radiographic exposure time

c) radiographic beam collimation.

d) radiographic film fog

58.

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

a) produce a radiograph with poor contrast distance

b) make it impossible to detect large discontinuities

c) result in unsharpness of the radiograph.

d) result in a fogged radiograph

59.

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

a) cardboard

b) plastic

c) steel

d) aluminum.

60.

Neutron penetration is greatest in which of the following materials?

a) hydrogenous material

b) water

c) lead.

d) boron carbide

Question 1 of 60

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