ASTM E1026

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 system. It is classified as a reference-standard dosimetry system (see ISO/ASTM 51261).

1.2 The practice describes the spectrophotometric analysis procedures for the Fricke dosimeter.

1.3 This practice applies only to gamma rays, x-rays (bremsstrahlung), and high-energy electrons.

1.4 This practice applies provided the following are satisfied:

1.4.1 The absorbed dose range shall be from 20 to 400 Gy (1).

1.4.2 The absorbed-dose rate does not exceed 10 ⁶ Gys¹ (2).

1.4.3 For radioisotope gamma-ray sources, the initial photon energy is greater than 0.6 MeV. For x-rays (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 (see ICRU Reports 34 and 35).

Note 1—The lower energy limits given are appropriate for a cylindrical dosimeter ampoule of 12-mm outside diameter. Corrections for dose gradients across an ampoule of that diameter or less are not required.

1.4.4 The irradiation temperature of the dosimeter should be within the range of 10 to 60C.

1.5 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 Documents

C912 Practice for Designing a Process for Cleaning Technical Glasses
D1193 Specification for Reagent Water
E170 Terminology Relating to Radiation Measurements and Dosimetry
E178 Practice for Dealing with Outlying Observations
E275 Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near Infrared 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
E925 Practice for the Periodic Calibration of Narrow Band-Pass Spectrophotometers
E958 Practice for Measuring Practical Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
ISO/ASTM 51205 Method for Using the Ceric-Cerous Sulfate Dosimetry System
ISO/ASTM 51261 Guide for Selection and Calibration of Dosimetry Systems for Radiation Processing
ISO/ASTM 51707 Estimating Uncertainties in Dosimetry for Radiation Processing
ICRU Report 34 The Dosimetry of Pulsed Radiation
ICRU Report 35 Radiation Dosimetry: Electrons with Initial Energies Between 1 and 50 MeV
ICRU Report 60 Fundamental Quantities and Units for Ionizing Radiation
ICRU Report 64 Dosimetry of High-Energy Photon Beams based on Standards of Absorbed Dose to Water
PIRS-0815 The IRS Fricke Dosimetry System

Index Terms

absorbed dose; dosimetry; ferrous ammonium sulfate dosimeter; ferrous sulfate dosimeter; Fricke dosimeter; reference-standard dosimeter; transfer-standard dosimeter; ICS Number Code 17.240

Citing ASTM Standards

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