ASTM ISO/ASTM51026-15
(Practice)Standard Practice for Using the Fricke Dosimetry System
Standard Practice for Using the Fricke Dosimetry System
SIGNIFICANCE AND USE
4.1 The Fricke dosimetry system provides a reliable means for measurement of absorbed dose to water, based on a process of oxidation of ferrous ions to ferric ions in acidic aqueous solution by ionizing radiation (ICRU 80, PIRS-0815,(4)). In situations not requiring traceability to national standards, this system can be used for absolute determination of absorbed dose without calibration, as the radiation chemical yield of ferric ions is well characterized (see Appendix X3).
4.2 The dosimeter is an air-saturated solution of ferrous sulfate or ferrous ammonium sulfate that indicates absorbed dose by an increase in optical absorbance at a specified wavelength. A temperature-controlled calibrated spectrophotometer is used to measure the absorbance.
SCOPE
1.1 This practice covers the procedures for preparation, testing and using the acidic aqueous ferrous ammonium sulfate solution dosimetry system to measure absorbed dose to water when exposed to ionizing radiation. The system consists of a dosimeter and appropriate analytical instrumentation. The system will be referred to as the Fricke dosimetry system. The Fricke dosimetry system may be used as either a reference standard dosimetry system or a routine dosimetry system.
1.2 This practice is one of a set of standards that provides recommendations for properly implementing dosimetry in radiation processing, and describes a means of achieving compliance with the requirements of ISO/ASTM Practice 52628 for the Fricke dosimetry system. It is intended to be read in conjunction with ISO/ASTM Practice 52628.
1.3 The practice describes the spectrophotometric analysis procedures for the Fricke dosimetry system.
1.4 This practice applies only to gamma radiation, X-radiation (bremsstrahlung), and high-energy electrons.
1.5 This practice applies provided the following are satisfied:
1.5.1 The absorbed dose range shall be from 20 to 400 Gy (1).2
1.5.2 The absorbed-dose rate does not exceed 106 Gy·s−1 (2).
1.5.3 For radioisotope gamma sources, the initial photon energy is greater than 0.6 MeV. For X-radiation (bremsstrahlung), the initial energy of the electrons used to produce the photons is equal to or greater than 2 MeV. For electron beams, the initial electron energy is greater than 8 MeV.
Note 1: The lower energy limits given are appropriate for a cylindrical dosimeter ampoule of 12 mm diameter. Corrections for displacement effects and dose gradient across the ampoule may be required for electron beams (3). The Fricke dosimetry system may be used at lower energies by employing thinner (in the beam direction) dosimeter containers (see ICRU Report 35).
1.5.4 The irradiation temperature of the dosimeter should be within the range of 10 to 60°C.
1.6 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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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.
ISO/ASTM 51026:2015(E)
Standard Practice for
1
Using the Fricke Dosimetry System
This standard is issued under the fixed designation ISO/ASTM 51026; the number immediately following the designation indicates the
year of original adoption or, in the case of revision, the year of last revision.
employingthinner(inthebeamdirection)dosimetercontainers(seeICRU
1. Scope
Report 35).
1.1 This practice covers the procedures for preparation,
1.5.4 Theirradiationtemperatureofthedosimetershouldbe
testingandusingtheacidicaqueousferrousammoniumsulfate
within the range of 10 to 60°C.
solution dosimetry system to measure absorbed dose to water
1.6 This standard does not purport to address all of the
when exposed to ionizing radiation. The system consists of a
safety concerns, if any, associated with its use. It is the
dosimeter and appropriate analytical instrumentation. The
responsibility of the user of this standard to establish appro-
system will be referred to as the Fricke dosimetry system. The
priate safety and health practices and determine the applica-
Fricke dosimetry system may be used as either a reference
bility of regulatory limitations prior to use.
standard dosimetry system or a routine dosimetry system.
1.2 This practice is one of a set of standards that provides
2. Referenced documents
recommendations for properly implementing dosimetry in
3
2.1 ASTM Standards:
radiation processing, and describes a means of achieving
C912Practice for Designing a Process for Cleaning Techni-
compliance with the requirements of ISO/ASTM Practice
cal Glasses
52628fortheFrickedosimetrysystem.Itisintendedtoberead
E170Terminology Relating to Radiation Measurements and
in conjunction with ISO/ASTM Practice 52628.
Dosimetry
1.3 The practice describes the spectrophotometric analysis
E178Practice for Dealing With Outlying Observations
procedures for the Fricke dosimetry system.
E275PracticeforDescribingandMeasuringPerformanceof
1.4 This practice applies only to gamma radiation, Ultraviolet and Visible Spectrophotometers
X-radiation (bremsstrahlung), and high-energy electrons. E666Practice for CalculatingAbsorbed Dose From Gamma
or X Radiation
1.5 This practice applies provided the following are satis-
E668 Practice for Application of Thermoluminescence-
fied:
Dosimetry (TLD) Systems for Determining Absorbed
1.5.1 The absorbed dose range shall be from 20 to 400 Gy
2
DoseinRadiation-HardnessTestingofElectronicDevices
(1).
6 −1 E925Practice for Monitoring the Calibration of Ultraviolet-
1.5.2 The absorbed-dose rate does not exceed 10 Gy·s
Visible Spectrophotometers whose Spectral Bandwidth
(2).
does not Exceed 2 nm
1.5.3 For radioisotope gamma sources, the initial photon
E958Practice for Estimation of the Spectral Bandwidth of
energy is greater than 0.6 MeV. For X-radiation
Ultraviolet-Visible Spectrophotometers
(bremsstrahlung), the initial energy of the electrons used to
3
2.2 ISO/ASTM Standards:
produce the photons is equal to or greater than 2 MeV. For
51261Practice for Calibration of Routine Dosimetry Sys-
electron beams, the initial electron energy is greater than 8
tems for Radiation Processing
MeV.
51707Guide for Estimating Uncertainties in Dosimetry for
NOTE1—Thelowerenergylimitsgivenareappropriateforacylindrical
Radiation Processing
dosimeter ampoule of 12 mm diameter. Corrections for displacement
52628Practice for Dosimetry in Radiation Processing
effects and dose gradient across the ampoule may be required for electron
beams (3).TheFrickedosimetrysystemmaybeusedatlowerenergiesby 2.3 ISO/IEC Standard:
ISO/IEC 17025General requirements for the competence of
4
testing and calibration laboratories
1
This practice is under the jurisdiction of ASTM Committee E61 on Radiation
Processing and is the direct responsibility of Subcommittee E61.02 on Dosimetry
Systems and is also under the jurisdiction of ISO/TC 85/WG 3.
3
Current edition approved Feb. 9, 2015. Published June 2015. Originally For referenced ASTM and ISO/ASTM standards, visit the ASTM webiste,
published as ASTM E1026–84. Last previous ASTM edition E1026–13. The www.astm.org, or contact ASTM Customer Service at service@astm.org. For
present International Standard ISO/ASTM 51026–2015(E) replaces ASTM Annual Book of ASTM Standards volume information, refer to the standard’s
E1026–13. Document Summary page on the ASTM website.
2 4
The boldface numbers that appear in parentheses refer to a bibliography at the Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
end of this practice. 4th Floor, New York, NY 10036, http://www.ansi.org.
© ISO/ASTM International 2018 – All rights reserved
1
---------------------- Page: 1 ---------------------
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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.
E1026:13
ISO/ASTM 51026 − 2015(E)
An American National Standard
Standard Practice for
1
Using the Fricke Dosimetry System
This standard is issued under the fixed designation E1026; ISO/ASTM 51026; 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
1.1 This practice covers the procedures for preparation, testing and using the acidic aqueous ferrous ammonium sulfate solution
dosimetry system to measure absorbed dose to water when exposed to ionizing radiation. The system consists of a dosimeter and
appropriate analytical instrumentation. The system will be referred to as the Fricke dosimetry system. The Fricke dosimetry system
may be used as either a reference standard dosimetry system or a routine dosimetry system.
1.2 This practice is one of a set of standards that provides recommendations for properly implementing dosimetry in radiation
processing, and describes a means of achieving compliance with the requirements of ISO/ASTM Practice E262852628 for the
Fricke dosimetry system. It is intended to be read in conjunction with ISO/ASTM Practice E262852628.
1.3 The practice describes the spectrophotometric analysis procedures for the Fricke dosimetry system.
1.4 This practice applies only to gamma radiation, X-radiation (bremsstrahlung), and high-energy electrons.
1.5 This practice applies provided the following are satisfied:
2
1.5.1 The absorbed dose range shall be from 20 to 400 Gy (1).
6 −1
1.5.2 The absorbed-dose rate does not exceed 10 Gy·s (2).
1.5.3 For radioisotope gamma sources, the initial photon energy is greater than 0.6 MeV. For X-radiation (bremsstrahlung), the
initial energy of the electrons used to produce the photons is equal to or greater than 2 MeV. For electron beams, the initial electron
energy is greater than 8 MeV.
NOTE 1—The lower energy limits given are appropriate for a cylindrical dosimeter ampoule of 12 mm diameter. Corrections for displacement effects
and dose gradient across the ampoule may be required for electron beams (3). The Fricke dosimetry system may be used at lower energies by employing
thinner (in the beam direction) dosimeter containers (see ICRU Report 35).
1.5.4 The irradiation temperature of the dosimeter should be within the range of 10 to 60°C.
1.6 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.
2. Referenced Documentsdocuments
3
2.1 ASTM Standards:
C912 Practice for Designing a Process for Cleaning Technical Glasses
E170 Terminology Relating to Radiation Measurements and Dosimetry
E178 Practice for Dealing With Outlying Observations
E275 Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers
E666 Practice for Calculating Absorbed Dose From Gamma or X Radiation
E668 Practice for Application of Thermoluminescence-Dosimetry (TLD) Systems for Determining Absorbed Dose in
Radiation-Hardness Testing of Electronic Devices
1
This practice is under the jurisdiction of ASTM Committee E61 on Radiation Processing and is the direct responsibility of Subcommittee E61.02 on Dosimetry Systems.
and is also under the jurisdiction of ISO/TC 85/WG 3.
Current edition approved Jan. 1, 2013Feb. 9, 2015. Published March 2013. Originally approved in 1984. Last previous edition approvedJune 2015. Originally published
ε1
as ASTM E1026–84. Last previous ASTM edition E1026 – 13. in 2004 asThe present International E1026 – 04 . DOI: 10.1520/E1026-13.Standard ISO/ASTM
51026–2015(E) replaces ASTM E1026 – 13.
2
The boldface numbers that appear in parentheses refer to a list of references bibliography at the end of this practice.
3
For referenced ASTM and ISO/ASTM standards, visit the ASTM webiste, www.astm.org, or 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 the ASTM website.
© ISO/ASTM International 2015 – All rights reserved
1
---------------------- Page: 1 ----------------------
ISO/ASTM 51026:2015(E)
E925 Practice for Monitoring the Calibration of Ultraviolet-Visible Spectrophotometers whose Spectral Bandwidth does not
Exce
...
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