ASTM 51026-23
(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 Gy 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 °C 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 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.
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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.
Designation: 51026 − 23
Standard Practice for
1
Using the Fricke Dosimetry System
This standard is issued under the fixed designation 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.
effects and dose gradient across the ampoule may be required for electron
1. Scope
beams (3). The Fricke dosimetry system may be used at lower energies by
1.1 This practice covers the procedures for preparation,
employing thinner (in the beam direction) dosimeter containers (see ICRU
testing, and using the acidic aqueous ferrous ammonium Report 35).
sulfate solution dosimetry system to measure absorbed dose to
1.5.4 The irradiation temperature of the dosimeter should be
water when exposed to ionizing radiation. The system consists
within the range of 10 °C to 60 °C.
of a dosimeter and appropriate analytical instrumentation. The
1.6 This standard does not purport to address all of the
system will be referred to as the Fricke dosimetry system. The
safety concerns, if any, associated with its use. It is the
Fricke dosimetry system may be used as either a reference
responsibility of the user of this standard to establish appro-
standard dosimetry system or a routine dosimetry system.
priate safety, health, and environmental practices and deter-
1.2 This practice is one of a set of standards that provides
mine the applicability of regulatory limitations prior to use.
recommendations for properly implementing dosimetry in
1.7 This international standard was developed in accor-
radiation processing, and describes a means of achieving
dance with internationally recognized principles on standard-
compliance with the requirements of ISO/ASTM Practice
ization established in the Decision on Principles for the
52628 for the Fricke dosimetry system. It is intended to be read
Development of International Standards, Guides and Recom-
in conjunction with ISO/ASTM Practice 52628.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.3 The practice describes the spectrophotometric analysis
procedures for the Fricke dosimetry system.
2. Referenced documents
1.4 This practice applies only to gamma radiation,
3
2.1 ASTM Standards:
X-radiation (bremsstrahlung), and high-energy electrons.
C912 Practice for Designing a Process for Cleaning Techni-
1.5 This practice applies provided the following are satis-
cal Glasses
fied:
E178 Practice for Dealing With Outlying Observations
1.5.1 The absorbed dose range shall be from 20 Gy to 400
E275 Practice for Describing and Measuring Performance of
2
Gy (1).
Ultraviolet and Visible Spectrophotometers
6 −1
1.5.2 The absorbed dose rate does not exceed 10 Gy·s
E666 Practice for Calculating Absorbed Dose From Gamma
(2).
or X Radiation
1.5.3 For radioisotope gamma sources, the initial photon
E668 Practice for Application of Thermoluminescence-
energy is greater than 0.6 MeV. For X-radiation
Dosimetry (TLD) Systems for Determining Absorbed
(bremsstrahlung), the initial energy of the electrons used to
Dose in Radiation-Hardness Testing of Electronic Devices
produce the photons is equal to or greater than 2 MeV. For
E925 Practice for Monitoring the Calibration of Ultraviolet-
electron beams, the initial electron energy is greater than
Visible Spectrophotometers whose Spectral Bandwidth
8 MeV.
does not Exceed 2 nm
E958 Practice for Estimation of the Spectral Bandwidth of
NOTE 1—The lower energy limits given are appropriate for a cylindrical
Ultraviolet-Visible Spectrophotometers
dosimeter ampoule of 12 mm diameter. Corrections for displacement
E3083 Terminology Relating to Radiation Processing: Do-
simetry and Applications
3
1 2.2 ISO/ASTM Standards:
This practice is under the jurisdiction of ASTM Committee E61 on Radiation
Processing and is the direct responsibility of Subcommittee E61.02 on Dosimetry 51261 Practice for Calibration of Routine Dosimetry Sys-
Systems. Originally developed as a joint ASTM/ISO standard in conjunction with
tems for Radiation Processing
ISO/TC 85/WG 3.
Current edition approved Dec. 1, 2023. Published January 2024. Originally
3
approved in 1984. Last previous edition approved in 2015 as ISO/ASTM For referenced ASTM and ISO/ASTM standards, visit the ASTM webiste,
51026–2015(E). DOI:10.1520/51026-23. www.astm.org, or contact ASTM Customer Service at service@astm.org. For
2
The boldface numbers that appear in parentheses refer to a bibliography at the Annual Book of ASTM Standards volum
...
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.
Designation: ISO/ASTM 51026 − 2015(E) 51026 − 23
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. 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 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:
2
1.5.1 The absorbed dose range shall be from 20 Gy to 400 Gy (1).
6 −1
1.5.2 The absorbed-dose 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. 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.10 °C to 60 °C.
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 . Originally developed as a joint ASTM/ISO standard in conjunction with ISO/TC 85/WG 3.
Current edition approved Feb. 9, 2015Dec. 1, 2023. Published January 2024June 2015. Originally published as ASTM E1026–84. Last previous ASTM . Originally
approved in 1984. Last previous edition E1026 – 13. The present International Standard ISO/ASTM 51026–2015(E) replaces ASTM approved in 2015 as ISO/ASTM
51026–2015(E). DOI:10.1520/51026-23.E1026 – 13.
2
The boldface numbers that appear in parentheses refer to a bibliography at the end of this practice.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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51026 − 23
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 healthsafety, health, and environmental practices and determine
the applicability of regulatory limitations prior to use.
1.7 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.
2. Referenced documents
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
...
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