ASTM C1673-10
(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.
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Designation:C1673–10
Standard Terminology of
1
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 accidentals, n—the detection of multiple neutron events
within the gate width that are not produced from the same
1.1 The terminology defined in this document is associated
fission.
with nondestructive assay of nuclear material.
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
correlated with a common origin (fission or cosmic-ray burst), that give
gamma-rays, or heat) directly or indirectly.
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.
2
2.1 ASTM Standards:
alpha, a, n—the ratio of the uncorrelated neutron emission
E456 Terminology Relating to Quality and Statistics
rate from (a, n) reactions to the spontaneous neutron
3
2.2 DOE Orders:
emission 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.
assay, v—to determine quantitatively the amount of one or
3. Terminology
more nuclides of interest contained in an item.
(alpha, n) reaction, n—a reaction that occurs when energetic attenuation correction, n—correction to the measured count
rate for attenuation of radiation that provides an estimate of
alpha particles collide with low atomic number nuclei
resulting in the emission of a neutron the unattenuated radiation emission rate of the radionuclides
240 240 240
being assayed.
Pu-effective mass, Pu , n—the mass of Pu that
eff
attenuation, n—reduction of radiation flux due to the interac-
would produce the same coincident neutron response in the
instrument as the assay item. tion of radiation with material between the source of the
radiation and the detector.
DISCUSSION—It is a function of the quantity of even mass isotopes of
background,n—extraneoussignalsuperimposedonthesignal
plutonium in the assay item and fundamental nuclear constants,
240
of interest.
sometimes referred to as effective Pu mass.
Beers Law, n—the fraction of uncollided gamma rays trans-
absorber foils, n—foils, usually of copper, tin, cadmium, or
mitted through layers of equal thickness of an absorber is a
lead, used to attenuate the gamma flux reaching a detector.
constant.
benign matrix,n—bulkmaterialthathasanegligibleeffecton
DISCUSSION—Absorber foils are used to reduce the count rate,
typically from intense low-energy X or gamma rays. the result of the measured parameter.
blank, n—a prepared item containing a matrix as similar as
practical to the items being measured that is free, to the
1
ThisterminologyisunderthejurisdictionofASTMCommitteeC26onNuclear
extent possible, of the radionuclides of interest.
Fuel Cycle and is the direct responsibility of Subcommittee C26.10 on Non
Destructive Assay.
DISCUSSION—The most important matrix parameters are those that
CurrenteditionapprovedJune1,2010.PublishedJuly2010.Originallyapproved
affect the result of the measurement technique being used.
´1
in 2007. Last previous edition approved in 2007 as C1673 - 07 . DOI: 10.1520/
C1673-10.
calibration standard, n—an item similar to the items to be
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
assayed, for which the parameters of interest and all prop-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on erties to which the measurement technique is sensitive are
the ASTM website.
known.
3
Available from the U.S. Department of Energy (DOE), 1000 Independence
Ave., SW Washington, DC 20585.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
C1673–10
DISCUSSION—Dead time is usually expressed as a percentage of
calorimeter, n—a device to measure heat or rate-of-heat
elapsed time.
generation.
calorimetric assay, n—determination of the mass of radioac-
delayed neutrons, n—ne
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
´1
Designation:C1673–07 Designation:C1673–10
Standard Terminology of
1
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
´ NOTE—Corrections were made throughout editorially in October 2007.
1. 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.
2. Referenced Documents
2
2.1 ASTM Standards:
E456 Terminology Relating to Quality and Statistics
3
2.2 DOE Orders:
DOE Order 435.1 Low-level Waste Requirements
DOE Order 5820.2 Radioactive Waste Management
3. Terminology
(alpha, n) reaction, n—a reaction that occurs when energetic alpha particles collide with low atomic number nuclei resulting in
the emission of a neutron
240 240 240
Pu-effective mass, Pu-effective mass, Pu ,n—the mass of Pu that would produce the same coincident neutron response
eff
in the instrument as the assay item.
DISCUSSION—It is a function of the quantity of even mass isotopes of plutonium in the assay item and fundamental nuclear constants, sometimes
240
referred to as effective Pu mass.
absorber foils, n—foils, usually of copper, tin, cadmium, or lead, used to attenuate the gamma flux reaching a detector.
DISCUSSION—Absorber foils are used to reduce the count rate, typically from intense low-energy X or gamma rays.
accidentals, n—the detection of multiple neutron events within the gate width that are not produced from the same fission.
DISCUSSION—Accidental events take their name from the fact that it is the accidental or random summing of neutrons, which are not time correlated
with a common origin (fission or cosmic-ray burst), that give rise to the appearance of a signature like that from genuine correlated events.
accuracy, n—(1) bias; (2) the closeness of a measured value to the true value; and (3) the closeness of a measured value to an
accepted reference or standard value.
active assay, n—assay based on the observation of radiation(s) induced by irradiation from an external source.
alpha, a, n—the ratio of the uncorrelated neutron emission rate from (a, n) reactions to the spontaneous neutron emission rate
from a non-multiplying item.
aperture, n—the size of the opening in the collimator through which the radiation of interest is intended to pass.
assay, v—to determine quantitatively the amount of one or more nuclides of interest contained in an item.
attenuation correction, n—correction to the measured count rate for attenuation of radiation that provides an estimate of the
unattenuated radiation emission rate of the radionuclides being assayed.
1
This terminology is under the jurisdiction ofASTM Committee C26 on Nuclear Fuel Cycle and is the direct responsibility of Subcommittee C26.10 on Non Destructive
Assay.
Current edition approved June 1, 2007. Published July 2007. DOI: 10.1520/C1673-07E01.
´1
Current edition approved June 1, 2010. Published July 2010. Originally approved in 2007. Last previous edition approved in 2007 as C1673 - 07 . DOI:
10.1520/C1673-10.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book ofASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
3
Available from the U.S. Department of Energy (DOE), 1000 Independence Ave., SW Washington, DC 20585.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
C1673–10
attenuation, n—reduction of radiation flux due to the interaction of radiation with material between the source of the radiation
and the detector.
background, n—extraneous signal superimposed on the signal of interest.
Beers Law, n—the fraction of uncollided gamma rays transmitted through layers of equal thickness of an absorber is a constant.
benign matrix, n—bulk material that has a negligible effect on the result of the measured parameter.
blank,n—aprepareditemcontainingama
...
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