ASTM E 1026 : 2023 : REDLINE
Current
The latest, up-to-date edition.
Standard Practice for Using the Fricke Dosimetry System
English
29-01-2024
Important note : Users cannot be edited or removed once added to your Multi user PDF.| Committee |
E 61
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| DocumentType |
Redline
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| Pages |
18
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| PublisherName |
American Society for Testing and Materials
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| Status |
Current
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| Supersedes |
1.1This 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.
1.2This 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.
1.3The practice describes the spectrophotometric analysis procedures for the Fricke dosimetry system.
1.4This practice applies only to gamma radiation, X-radiation (bremsstrahlung), and high-energy electrons.
1.5This practice applies provided the following are satisfied:
1.5.1The absorbed dose range shall be from 20 Gy to 400 Gy (1).2
1.5.2The absorbed dose rate does not exceed 106 Gy·s−1 (2).
1.5.3For 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).
1.5.4The irradiation temperature of the dosimeter should be within the range of 10 °C to 60 °C.
1.6This 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.
1.7This 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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