ASTM C1673-10a(2018)
(Terminology)Standard Terminology of C26.10 Nondestructive Assay Methods
Standard Terminology of C26.10 Nondestructive Assay Methods
SCOPE
1.1 The terminology defined in this document is associated with nondestructive assay of nuclear material.
1.2 All of the definitions are associated with measurement techniques that measure nuclear emissions (that is, neutrons, gamma-rays, or heat) directly or indirectly.
1.3 Definitions are relevant to any standards and guides written by subcommittee C26.10.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
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Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C1673 − 10a (Reapproved 2018)
Standard Terminology of
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C26.10 Nondestructive Assay Methods
This standard is issued under the fixed designation C1673; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope absorber foils, n—foils, usually of copper, tin, cadmium, or
lead, used to attenuate the gamma flux reaching a detector.
1.1 The terminology defined in this document is associated
DISCUSSION—Absorber foils are used to reduce the count rate,
with nondestructive assay of nuclear material.
typically from intense low-energy X or gamma rays.
1.2 All of the definitions are associated with measurement
accidentals,n—thedetectionofmultipleneutroneventswithin
techniques that measure nuclear emissions (that is, neutrons,
the gate width that are not produced from the same fission.
gamma-rays, or heat) directly or indirectly.
DISCUSSION—Accidental events take their name from the fact that it
1.3 Definitions are relevant to any standards and guides
is the accidental or random summing of neutrons, which are not time
written by subcommittee C26.10. correlated with a common origin (fission or cosmic-ray burst), that give
rise to the appearance of a signature like that from genuine correlated
1.4 This international standard was developed in accor-
events.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the active assay, n—assay based on the observation of radiation(s)
Development of International Standards, Guides and Recom- induced by irradiation from an external source.
mendations issued by the World Trade Organization Technical
alpha,α,n—the ratio of the uncorrelated neutron emission rate
Barriers to Trade (TBT) Committee.
from (α, n) reactions to the spontaneous neutron emission
rate from a non-multiplying item.
2. Referenced Documents
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2.1 ASTM Standards:
aperture, n—the size of the opening in the collimator through
E456 Terminology Relating to Quality and Statistics
which the radiation of interest is intended to pass.
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2.2 DOE Orders:
assay, v—to determine quantitatively the amount of one or
DOE Order 435.1 Low-level Waste Requirements
more nuclides of interest contained in an item.
DOE Order 5820.2 Radioactive Waste Management
attenuation correction, n—correction to the measured count
3. Terminology
rate for attenuation of radiation that provides an estimate of
(alpha, n) reaction, n—a reaction that occurs when energetic
the unattenuated radiation emission rate of the radionuclides
alpha particles collide with low atomic number nuclei
being assayed.
resulting in the emission of a neutron.
attenuation, n—reduction of radiation flux due to the interac-
240 240 240
Pu-effective mass, Pu , n—the mass of Pu that
eff
tion of radiation with material between the source of the
would produce the same coincident neutron response in the
radiation and the detector.
instrument as the assay item.
background, n—extraneous signal superimposed on the signal
DISCUSSION—It is a function of the quantity of even mass isotopes of
plutonium in the assay item and fundamental nuclear constants,
of interest.
240
sometimes referred to as effective Pu mass.
Beers Law, n—the fraction of uncollided gamma rays trans-
mitted through layers of equal thickness of an absorber is a
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ThisterminologyisunderthejurisdictionofASTMCommitteeC26onNuclear
constant.
Fuel Cycle and is the direct responsibility of Subcommittee C26.10 on Non
Destructive Assay.
benign matrix,n—bulk material that has a negligible effect on
Current edition approved April 1, 2018. Published May 2018. Originally
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approved in 2007. Last previous edition approved in 2010 as C1673 – 10a . DOI:
the result of the measured parameter.
10.1520/C1673-10AR18.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
blank, n—a prepared item containing a matrix as similar as
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
practical to the items being measured that is free, to the
Standards volume information, refer to the standard’s Document Summary page on
extent possible, of the radionuclides of interest.
the ASTM website.
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DISCUSSION—The most important matrix parameters are those that
Available from the U.S. Department of Energy (DOE), 1000 Independence
Ave., SW Washington, DC 20585. affect the result of the measurement technique being used.
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