ASTM E1026-95 - 1.1.1995
 
1. Scope

1.1 This practice covers the preparation, testing and procedure for using the acidic aqueous ferrous ammonium sulfate solution dosimetry system to measure absorbed dose in water when exposed to ionizing radiation. The system consists of a dosimeter and appropriate analytical instrumentation. For simplicity, the system will be referred to as the Fricke system. It is classified as a reference standard dosimeter (see Guide E1261).

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

1.3 This practice applies only to [gamma] rays, x rays, and high-energy electrons.

1.4 This practice applies provided the following are satisfied:

1.4.1 The absorbed dose range shall be from 40 to 400 Gy (1).

1.4.2 The absorbed dose rate shall not exceed 106 Gy[dot]s -1 (2).

1.4.3 For radioisotope gamma-ray sources, the initial photon energy shall be greater than 0.6 MeV. For bremsstrahlung photons, the initial energy of the electrons used to produce the bremsstrahlung photons shall be equal to or greater than 2 MeV. For electron beams, the initial electron energy shall be 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 diameter. Corrections for dose gradients across an ampoule of that diameter or less are not required. The Fricke system may be used at lower energies by employing thinner (in the beam direction) dosimeter containers (see ICRU Report 35).

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

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

E178-21

Standard Practice for Dealing With Outlying Observations

E170-24

Standard Terminology Relating to Radiation Measurements and Dosimetry

JCGM 100:2008 GUM 1995

, with minor corrections, Evaluation of measurement data - Guide to the expression of uncertainty in measurement

ICRU Report 64

Dosimetry of High-Energy Photon Beams based on Standards of Absorbed Dose to Water

C912-17(2022)

Standard Practice for Designing a Process for Cleaning Technical Glasses

ISO/IEC 17025

General requirements for the competence of testing and calibration laboratories Available from American National Standards Institute (ANSI), 25 W. 43rd St., 4th Floor, New York, NY 10036, http://www.ansi.org.

ICRU Report 14

Radiation Dosimetry: X Rays and Gamma Rays with Maximum Photon Energies Between 0.6 and 50 MeV

E275-08(2022)

Standard Practice for Describing and Measuring Performance of Ultraviolet and Visible Spectrophotometers

E666-21

Standard Practice for Calculating Absorbed Dose From Gamma or X Radiation

E668-20

Standard Practice for Application of Thermoluminescence-Dosimetry (TLD) Systems for Determining Absorbed Dose in Radiation-Hardness Testing of Electronic Devices

E925-09(2022)

Standard Practice for Monitoring the Calibration of Ultraviolet-Visible Spectrophotometers whose Spectral Bandwidth does not Exceed 2 nm

E958-13(2021)

Standard Practice for Estimation of the Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers

51261-13(2020)e1

Standard Practice for Calibration of Routine Dosimetry Systems for Radiation Processing (Includes all amendments and changes 11/25/2024).

51707-22

Standard Guide for Estimation of Measurement Uncertainty in Dosimetry for Radiation Processing

ICRU Report 80

Dosimetry Systems for Use in Radiation Processing

ICRU Report 35

Radiation Dosimetry: Electrons with Initial Energies Between 1 and 50 MeV

52628-19

Standard Practice for Dosimetry in Radiation Processing

ICRU Report 85a

Fundamental Quantities and Units for Ionizing Radiation