ISO/ASTM 51707:2015

Guide for estimation of measurement uncertainty in dosimetry for radiation processing

ISO/ASTM 51707:2015 provides guidance on the use of concepts described in the JCGM Evaluation of Measurement Data ? Guide to the Expression of Uncertainty in Measurement (GUM) to estimate the uncertainties in the measurement of absorbed dose in radiation processing. Methods are given for identifying, evaluating and estimating the components of measurement uncertainty associated with the use of dosimetry systems and for calculating combined standard measurement uncertainty and expanded (overall) uncertainty of dose measurements based on the GUM methodology. Examples are given on how to develop a measurement uncertainty budget and a statement of uncertainty. ISO/ASTM 51707:2015 is one of a set of standards that provides recommendations for properly implementing dosimetry in radiation processing, and provides guidance for achieving compliance with the requirements of ISO/ASTM 52628 related to the evaluation and documentation of the uncertainties associated with measurements made with a dosimetry system. It is intended to be read in conjunction with ISO/ASTM 52628, ISO/ASTM 51261 and ISO/ASTM 52701.

Guide pour l’estimation de l’incertitude de mesure en dosimétrie pour le traitement par irradiation

General Information

• Status: Published
• Publication Date: 16-Mar-2015
• ICS: 17.240 - Radiation measurements
• Technical Committee: ISO/TC 85 - Nuclear energy, nuclear technologies, and radiological protection
• Drafting Committee: ISO/TC 85 - Nuclear energy, nuclear technologies, and radiological protection
• Current Stage: 9599 - Withdrawal of International Standard
• Due Date: 04-Apr-2025
• Completion Date: 04-Apr-2025

Relations

• Revises: ISO/ASTM 51707:2005 - Guide for estimating uncertainties in dosimetry for radiation processing
• Effective Date: 07-Jun-2014

Standards Content (Sample)

INTERNATIONAL ISO/ASTM
STANDARD 51707
Third edition
2015-03-15
Guide for estimation of measurement un-
certainty in dosimetry for radiation pro-
cessing
Guide pour l’estimation de l’incertitude de mesure en dosimétrie
pour le traitement par irradiation
Reference number
© ISO/ASTM International 2015
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ii © ISO/ASTM International 2015 – All rights reserved

Contents Page
1 Scope. 1
2 Referenced documents. 1
3 Terminology. 2
4 Significance and use. 4
5 Basic concepts—components of uncertainty. 4
6 Evaluation of Type A and Type B standard uncertainty. 4
7 Examples of uncertainty budget components associated with absorbed dose measurements. 5
8 Characterization of uncertainty components based on probability distributions. 6
9 Statement of uncertainty. 8
10 Uses of measurement uncertainty estimates . 8
11 Keywords. 9
Annexes. 9
Bibliography. 11
Figure1 Normal distribution, also called Gaussian or “bell curve”, the most important continuous
random distribution (JCGM 100:2008) . 7
Figure 2 Rectangular distribution, also called continuous uniform distribution (JCGM 100:2008). 7
Table A2.1 . 10
Table A2.2 . 11
© ISO/ASTM International 2015 – All rights reserved iii

Foreword
ISO(theInternationalOrganizationforStandardization)isaworldwidefederationofnationalstandardsbodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for
voting. Publication as an International Standard requires approval by at least 75% of the member bodies
casting a vote.
ASTM International is one of the world’s largest voluntary standards development organizations with global
participation from affected stakeholders. ASTM technical committees follow rigorous due process balloting
procedures.
A project between ISO and ASTM International has been formed to develop and maintain a group of
ISO/ASTM radiation processing dosimetry standards. Under this project, ASTM Committee E61, Radiation
Processing, is responsible for the development and maintenance of these dosimetry standards with
unrestricted participation and input from appropriate ISO member bodies.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. Neither ISO nor ASTM International shall be held responsible for identifying any or all such patent
rights.
International Standard ISO/ASTM 51707 was developed by ASTM Committee E61, Radiation Processing,
through Subcommittee E61.01, Dosimetry, and by Technical Committee ISO/TC 85, Nuclear energy, nuclear
technologies and radiological protection.
This third edition cancels and replaces the second edition (ISO/ASTM 51707:2005), which has been
technically revised.
iv © ISO/ASTM International 2015 – All rights reserved

An American National Standard
Standard Guide for
Estimation of Measurement Uncertainty in Dosimetry for
Radiation Processing
This standard is issued under the fixed designation ISO/ASTM 51707; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision.
1. Scope priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
1.1 This standard provides guidance on the use of concepts
described in the JCGM Evaluation of Measurement Data –
2. Referenced documents
Guide to the Expression of Uncertainty in Measurement
(GUM) to estimate the uncertainties in the measurement of
2.1 ASTM Standards:
absorbed dose in radiation processing.
E170 Terminology Relating to Radiation Measurements and
1.2 Methods are given for identifying, evaluating and esti- Dosimetry
mating the components of measurement uncertainty associated E456 Terminology Relating to Quality and Statistics
with the use of dosimetry systems and for calculating com- 2
2.2 ISO/ASTM Standards:
bined standard measurement uncertainty and expanded (over-
51261 Practice for Calibration of Routine Dosimetry Sys-
all) uncertainty of dose measurements based on the GUM
tems for Radiation Processing
methodology.
51608 Practice for Dosimetry in an X-Ray (Bremsstrahlung)
1.3 Examples are given on how to develop a measurement
Facility for Radiation Processing
uncertainty budget and a statement of uncertainty.
51649 Practice for Dosimetry in an Electron Beam Facility
for Radiation Processing at Energies Between 300 keV
1.4 This document is one of a set of standards that provides
and 25 MeV
recommendations for properly implementing dosimetry in
51702 Practice for Dosimetry in a Gamma Facility for
radiation processing, and provides guidance for achieving
Radiation Processing
compliancewiththerequirementsofISO/ASTM52628related
52628 Practice for Dosimetry in Radiation Processing
to the evaluation and documentation of the uncertainties
52701 Guide for Performance Characterization of Dosim-
associated with measurements made with a dosimetry system.
eters and Dosimetry systems for Use in Radiation Pro-
ItisintendedtobereadinconjunctionwithISO/ASTM52628,
cessing
ISO/ASTM 51261 and ISO/ASTM 52701.
2.3 ISO Documents:
1.5 Thisguidedoesnotaddresstheestablishmentofprocess
specifications or conformity assessment. ISO 11137-1 Sterilization of Health Care Products – Radia-
tion – Requirements for Development, Validation and
1.6 This standard does not purport to address all of the
Routine Control of a Sterilization Process
safety concerns, if any, associated with its use. It is the
ISO/IEC 17025 General Requirements for the Competence
responsibility of the user of this standard to establish appro-
of Testing and Calibration Laboratories
This guide is under the jurisdiction of ASTM Committee E61 on Radiation
Processing and is the direct responsibility of Subcommittee E61.01 on Dosimetry, For referenced ASTM and ISO/ASTM standards, visit the ASTM website,
and is also under the jurisdiction of ISO/TC 85/WG 3. www.astm.org, or contact ASTM Customer Service at [e-mail]. For
Current edition approved by ASTM Sept. 8, 2014. Published February 2015. Annual Book of ASTM Standards volume information, refer to the standard’s
Originally published as ASTM E 1707–95. Last previous ASTM edition Document Summary page on the ASTM website.
ε1 ε1 3
E 1707–95 .ASTME 1707–95 wasadoptedbyISOin1998withtheintermediate Available from Association for the Advancement of Medical Instrumentation,
designation ISO 15572:1998(E). The present International Standard ISO/ASTM 1110 North Glebe Road, Suite 220, Arlington, VA 22201-4795, U.S.A.
51707:2015(E) is a major revision of the last previous edition ISO/ASTM Available from International Organization for Standardization (ISO), 1, ch. de
51707:2005(E), which replaced ISO/ASTM 51707:2002(E). la Voie-Creuse, CP 56, CH-1211 Geneva 20, Switzerland, http://www.iso.org.
© ISO/ASTM International 2015 – All rights reserved
2.4 Joint Committee for Guides in Metrology (JCGM) 3.2.4 coeffıcient of variation (CV)—sample standard devia-
Reports:
tion expressed as a percentage of sample average value (see
JCGM 100:2008, GUM 1995, with minor correc- 3.2.2 and 3.2.19):
tions, Evaluation of measurement data – Guide to the
S
CV 5 3100 % (2)
Expression of Uncertainty in Measurement
x¯
JCGM 200:2008, VIM, International vocabulary of metrol-
3.2.5 combined standard measurement uncertainty [VIM,
ogy – Basis and general concepts and associated terms
2.31]—standard measurement uncertainty that is obtained us-
2.5 ICRU Reports:
ing the individual standard measurement uncertainties associ-
ICRU Report 80 Dosimetry Systems for Use in Radiation
ated with the input quantities in a measurement model.
Processing
3.2.5.1 Discussion—
ICRU Report 85a Fundamental Quantities and Units for
(1) Itisalsoreferredtoas‘combinedstandarduncertainty’.
Ionizing Radiation
(2) In case of correlations of input quantities in a measure-
ment model, covariances must also be taken into account when
3. Terminology
calculating the combined standard measurement uncertainty.
3.1 Definitions:
3.2.6 coverage factor (k) [VIM, 2.38]—number larger than
NOTE 1—For definitions quoted here from VIM, only the text of the
one by which a combined standard measurement uncertainty is
definition is kept here. Any NOTES or EXAMPLES are not included.
multiplied to obtain an expanded measurement uncertainty.
They can be reviewed by referring to VIM (JCGM 200:2008).
3.2.6.1 Discussion—Acoverage factor, k, is typically in the
3.2 Definitions:
range of 2 to 3 (see 5.2.4).
3.2.1 approved laboratory—laboratory that is a recognized
3.2.7 expanded uncertainty [GUM, 2.3.5]—quantity defin-
national metrology institute; or has been formally accredited to
ing the interval about the result of a measurement that may be
ISO/IEC 17025; or has a quality system consistent with the
expected to encompass a large fraction of the distribution of
requirements of ISO/IEC 17025.
values that could reasonably be attributed to the measurand.
3.2.1.1 Discussion—A recognized national metrology insti-
tute or other calibration laboratory accredited to ISO/IEC
3.2.7.1 Discussion—Expanded uncertainty is obtained by
17025 should be used for irradiation of dosimeters or dose multiplying the combined standard uncertainty by a coverage
measurements for calibration in order to ensure traceability to
factor, the value of which determines the magnitude of the
a national or international standard. A calibration certificate
‘fraction’. Expanded uncertainty is also referred to as ‘overall
provided by a laboratory not having formal recognition or
uncertainty’.
accreditation will not necessarily be proof of traceability to a
3.2.8 influence quantity [VIM, 2.52]—quantity that, in a
national or international standard.
direct measurement, does not affect the quantity that is actually
3.2.2 arithmetic mean, average [GUM, C.2.19]—sum of
measured, but affects the relation between the indication and
values divided by the number of values:
the measurement result.
3.2.8.1 Discussion—In radiation processing dosimetry, this
x¯ 5 x , i 51, 2, 3 … n (1)
( i
n
i
term includes temperature, relative humidity, time intervals,
light, radiation energy, absorbed dose rate, and other factors
where:
that might affect dosimeter response, as well as quantities
x = individual values of parameters with i=1,2,3. n.
i
associated with the measurement instrument.
3.2.2.1 Discussion—The term ‘mean’ is used generally
3.2.9 level of confidence—probability that the value of a
when referring to a population parameter and the term ‘aver-
parameter will fall within the given range.
age’ when referring to the result of a calculation on the data
3.2.10 measurand[VIM,2.3]—quantityintendedtobeme
...