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ASTM E2003M-98

(Practice)

Practice for Fabrication of the Neutron Radiographic Beam Purity Indicators

Practice for Fabrication of the Neutron Radiographic Beam Purity Indicators

SCOPE
1.1 This practice covers the material and fabrication of a Beam Purity Indicator (BPI), which can be used to determine the relative quality of radiographic images produced by direct, thermal neutron radiographic examination.
1.2 The values stated in SI units are to be regarded as the standard.
1.3 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Withdrawn
Publication Date
09-Dec-1998
ICS
37.040.25 - Radiographic films
Technical Committee
E07 - Nondestructive Testing
Drafting Committee
E07.05 - Radiology (Neutron) Method
Current Stage
Ref Project

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ASTM E2003M-98 - Practice for Fabrication of the Neutron Radiographic Beam Purity IndicatorsASTM E2003M-98 - Practice for Fabrication of the Neutron Radiographic Beam Purity Indicators
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ASTM E2003M-98 - Practice for Fabrication of the Neutron Radiographic Beam Purity Indicators
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Standards Content (Sample)

Designation: E 2003M - 98
METRIC
4CTb
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA i9428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
Fabrication of the Neutron Radiographic Beam Purity
Indicators'
This standard is issued under the fixed designation E 2003M; the number immediately following the designation indicates the year of
or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
original adoption
superscript epsilon (E) indicates an editorial change since the last revision or reapproval.
1. Scope and processing quality.
4.2 Neutron radiography practices are discussed in Practice
1.1 This practice covers the and fabrication of a
E 748.
Beam Purity Indicator (BPI), which can be used to determine
the relative quality of radiographic images produced by direct,
5. Significance and Use
thermal neutron radiographic examination.
5.1 The BPI is designed to yield quantitative information
1.2 The values stated in SI units are regarded to be standard.
concerning neutron beam and image system parameters that
1.3 This standard does not purport to address the safety
contribute to film exposure, and thereby, affect overall image
concerns, ifany, associated with its use. It is the responsibility
quality. For proper measurements of film exposure due to the
of the user of this standard to establish appropriate safety and
neutron beam constituents, the BPI must be fabricated in
health practices and determine the applicability of regulatory
accordance with this practice.
limitations prior to use.
5.2 This practice shall be followed for the fabrication of all
2. Referenced Documents Beam Purity Indicators to be used with Method E 545 to
determine image quality in direct thermal neutron radiography.
2.1 ASTM Standards:
E 543 Practice for Agencies Performing Nondestructive
6. Basis of Application
Testing2
6.1 Qualfication of Nondestructive Agencies-If specified
E 545 Method for Determining Image Quality in Direct
in the contractual agreement, NDT agencies shall be qualified
Thermal Neutron Radiographic Examination2
and evaluated as described in Practice E 543. The applicable
E 748 Practices for Thermal Neutron Radiography of Ma-
revision of Practice E 543 shall be specified in the contractual
tenais2
agreement.
E 13 16 Terminology for Nondestructive Examinations2
6.2 Procedures and Techniques-The procedures and tech-
3. Terminology niques to be utilized shall be as described in this practice unless
otherwise specified. Specific techniques may be specified in the
3.1 Definitions-For definitions of terms used in this prac-
contractual agreement.
tice, see Terminology E 13 16, Section H.
6.3 Reporting CriteridAcceptance Criteria-Reporting cri-
4. Summary of Practice teria for the examination results shall be in accordance with
Sections 9 and 10 unless otherwise specified. Acceptance
4.1 The BPI is used for quantitative determination of
criteria, for example, for reference radiographs, shall be
thermal neutron radiographic quality. It consists of a polytet-
specified in the contractual agreement.
rafluoroethylene block containing two boron nitride disks, two
6.4 Reexamination of Repaired/Reworked Items-
lead disks and two cadmium wires. A key feature of the device
Reexamination of repairedreworked items is not addressed in
is the ability to make visual analysis of its image for subjective
this practice and, if required, shall be specified in the contrac-
of the image
quality information. Densitometric measurements
tual agreement.
of the device permit quantitative determination of radiographic
contrast, low-energy photon contribution, pair production con-
7. Beam Purity Indicator (BPI)
tribution, image unsharpness, and information regarding film
7.1 The BPI shall be constructed of polytetrafluoroethylene,
cadmium, lead, and boron nitride.
7.2 The construction and dimensions shall be as shown in
' This practice is under the jurisdiction of ASTM Committee E-O7 on Nonde-
structive Testing and is the direct responsibility of Subcommittee E07.05 on
Fig. 1.
Radiology (Neutron) Method.
7.3 The BPI may be encased in a frame for easy mounting
Current edition approved Dec. 10, 1998. Published February 1999.
but shall not be enclosed in a dust cover nor shall any material
Annual Book of ASTM Stundards, Vol 03.03.
-- Reproduced By GLOBAL
1 a ENCiNEERWG DOCUMEN1S
-- -=
- With The Pamission OfASTM
--
-5 UnderRoydiy Apeemmu
--
1

---------------------- Page: 1 ----------------------
\ +,w LPRiSS FIT INTO GROOVE
**
Polytetrafluoroethylene
Cadmium 99.9 % pure
Lead 99.9 % pure
BN-Boron nitride
Hot-pressed, 40 % min elemental boron
NOTE 1-Pb and BN disks are 4-mm in diameter and 2-mm thick (minimum thickness).
FIG. 1 Beam Purity Indicator
8.1.9 Prepare a 4-mm diameter rod of lead (a lathe may be
cov
...

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5.1 The BPI is designed to yield quantitative information concerning neutron beam and image system parameters that contribute to film exposure and, thereby, affect overall image quality. For proper measurements of film exposure due to the neutron beam constituents, the BPI must be fabricated in accordance with this practice.  
5.2 This practice shall be followed for the fabrication of all Beam Purity Indicators to be used with Method E545 to determine image quality in direct thermal neutron radiography.
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1.2 The values stated in SI units are regarded to be standard.  
1.3 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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SIGNIFICANCE AND USE
5.1 The only truly valid image quality indicator is a material or component, equivalent to the part being neutron radiographed, with a known standard discontinuity, inclusion, omission or flaw (reference standard comparison part). The SI is designed to substitute for the reference standard, providing qualitative information on hole and gap sensitivity in a single unit. Fabrication in accordance with this practice is vital for accurate and consistent measurements.  
5.2 This practice shall be followed for the fabrication of all SIs to be used with Method E545 to determine image quality in direct thermal neutron radiography.
SCOPE
1.1 This practice covers the fabrication of Sensitivity Indicators (SI), which can be used to determine the relative quality of radiographic images produced by direct, thermal neutron radiographic examination.  
1.2 The values stated in inch-pound units are regarded to be standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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SIGNIFICANCE AND USE
4.1 This standard provides a practice for RIQR evaluations of film and non-film imaging systems when exposed through steel or plastic materials. Three alternate data evaluation methods are provided in Section 9. Determining RIQR requires the comparison of at least two radiographs or radiographic processes whereby the relative degree of image quality difference may be determined using the EPS plaque arrangement of Fig. 1 as a relative image quality indicator (RIQI). In conjunction with the RIQI, a specified radiographic technique or method must be established and carefully controlled for each radiographic process. This practice is designed to allow the determination of subtle changes in EPS that may arise to radiographic imaging system performance levels resultant from process improvements/changes or change of equipment attributes. This practice does not address relative unsharpness of a radiographic imaging system as provided in Practice E2002. The common element with any relative comparison is the use of the same RIQI arrangement for both processes under evaluation.  
4.2 In addition to the standard evaluation method described in Section 9, there may be other techniques/methods in which the basic RIQR arrangement of Fig. 1 might be utilized to perform specialized assessments of relative image quality performance. For example, other radiographic variables can be altered to facilitate evaluations provided these differences are known and documented for both processes. Where multiple radiographic process variables are evaluated, it is incumbent upon the user of this practice to control those normal process attributes to the degree suitable for the application. Specialized RIQR techniques may also be useful with micro focus X-ray, isotope sources of radiation or with the use of non-film radiographic imaging systems. RIQR may also be useful in evaluating imaging systems with alternate materials (RIQI and base plate) such as copper-nickel or aluminum. When using any of t...
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1.1 This standard provides a practice whereby industrial radiographic imaging systems may be comparatively assessed using the concept of relative image quality response (RIQR). The RIQR method presented within this practice is based upon the use of equivalent penetrameter sensitivity (EPS) described within Practice E1025 and subsection 5.2 of this practice. Figure 1 illustrates a relative image quality indicator (RIQI) that has four different steel plaque thicknesses (.015, .010, .008, and .005 in.) sequentially positioned (from top to bottom) on a 3/4-in. thick steel plate. The four plaques contain a total of 14 different arrays of penetrameter-type hole sizes designed to render varied conditions of threshold visibility ranging from 1.92 % EPS (at the top) to .94 % EPS (at the bottom) when exposed to nominal 200 keV X-ray radiation. Each “EPS” array consists of 30 identical holes; thus, providing the user with a quantity of threshold sensitivity levels suitable for relative image qualitative response comparisons.  
1.2 This practice is not intended to qualify the performance of a specific radiographic technique nor for assurance that a radiographic technique will detect specific discontinuities in a specimen undergoing radiographic examination. This practice is not intended to be used to classify or derive performance classification categories for radiographic imaging systems. For example, performance classifications of radiographic film systems may be found within Test Method E1815.  
1.3 This practice contains an alternate provision whereby industrial radiographic imaging systems may be comparatively assessed using Lucite plastic material exposed to nominal 30 keV X-ray radiation. The RIQI for this alternate evaluation is also illustrated in Fig. 1, except the plaque and base plate materials are constructed of Lucite plastic in lieu of steel. EPS values for Lucite plastic are provided in Section 5 based upon the us...

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