ASTM C1673-10ae1
(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.
General Information
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Standards Content (Sample)
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Designation: C1673 − 10a
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.
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´ NOTE—Text was added editorially to the definition of “working standard” in August 2011.
DISCUSSION—Absorber foils are used to reduce the count rate,
1. Scope
typically from intense low-energy X or gamma rays.
1.1 The terminology defined in this document is associated
with nondestructive assay of nuclear material. accidentals,n—thedetectionofmultipleneutroneventswithin
the gate width that are not produced from the same fission.
1.2 All of the definitions are associated with measurement
DISCUSSION—Accidental events take their name from the fact that it
techniques that measure nuclear emissions (that is, neutrons,
is the accidental or random summing of neutrons, which are not time
gamma-rays, or heat) directly or indirectly.
correlated with a common origin (fission or cosmic-ray burst), that give
rise to the appearance of a signature like that from genuine correlated
1.3 definitions are relevant to any standards and guides
events.
written by subcommittee C26.10.
active assay, n—assay based on the observation of radiation(s)
2. Referenced Documents
induced by irradiation from an external source.
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2.1 ASTM Standards:
alpha,α,n—the ratio of the uncorrelated neutron emission rate
E456 Terminology Relating to Quality and Statistics
from (α, n) reactions to the spontaneous neutron emission
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2.2 DOE Orders:
rate from a non-multiplying item.
DOE Order 435.1 Low-level Waste Requirements
aperture, n—the size of the opening in the collimator through
DOE Order 5820.2 Radioactive Waste Management
which the radiation of interest is intended to pass.
3. Terminology
assay, v—to determine quantitatively the amount of one or
more nuclides of interest contained in an item.
(alpha, n) reaction, n—a reaction that occurs when energetic
alpha particles collide with low atomic number nuclei
attenuation correction, n—correction to the measured count
resulting in the emission of a neutron
rate for attenuation of radiation that provides an estimate of
240 240 240
Pu-effective mass, Pu , n—the mass of Pu that
the unattenuated radiation emission rate of the radionuclides
eff
would produce the same coincident neutron response in the
being assayed.
instrument as the assay item.
attenuation, n—reduction of radiation flux due to the interac-
DISCUSSION—It is a function of the quantity of even mass isotopes of
tion of radiation with material between the source of the
plutonium in the assay item and fundamental nuclear constants,
240
sometimes referred to as effective Pu mass.
radiation and the detector.
absorber foils, n—foils, usually of copper, tin, cadmium, or
background, n—extraneous signal superimposed on the signal
lead, used to attenuate the gamma flux reaching a detector.
of interest.
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 Nov. 1, 2010. Published December 2010. Originally
approved in 2007. Last previous edition approved in 2010 as C1673 - 10. DOI:
the result of the measured parameter.
10.1520/C1673-10AE01.
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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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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C1673 − 10a
calibration standard, n—an item similar to the items to be control limits, n—the limits beyond which it is statistically
assayed, for which the parameters of interest and all prop- highlyimprobablethatoneorseveralpoint(s)couldliewhile
erties to which the measurement technique is sensitive
...
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