ASTM E1026-13
Standard Practice for Using the Fricke Dosimetry System

Standard No.

ASTM E1026-13

Release Date

2013

Published By

American Society for Testing and Materials (ASTM)

Latest

ASTM E1026-13

Scope

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 (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 (ICRU 80).

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 Practice E2628 for the Fricke dosimetry system. It is intended to be read in conjunction with Practice E2628.

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 ......

ASTM E1026-13 Referenced Document

• ASTM C912 Standard Practice for Designing a Process for Cleaning Technical Glasses
• ASTM E170 Standard Terminology Relating to Radiation Measurements and Dosimetry
• ASTM E178 Standard Practice for Dealing With Outlying Observations
• ASTM E2628 Practice for Dosimetry in Radiation Processing
• ASTM E275 Standard Practice for Describing and Measuring Performance of Ultraviolet, Visible, and Near-Infrared Spectrophotometers
• ASTM E666 Standard Practice for Calculating Absorbed Dose From Gamma or X Radiation
• ASTM E668 Standard Practice for Application of Thermoluminescence-Dosimetry (TLD) Systems for Determining Absorbed Dose in Radiation-Hardness Testing of Electronic Devices
• ASTM E925 Standard Practice for Monitoring the Calibration of Ultraviolet-Visible Spectrophotometers whose Spectral Slit Width does not Exceed 2 nm
• ASTM E958 Standard Practice for Measuring Practical Spectral Bandwidth of Ultraviolet-Visible Spectrophotometers
• ISO/ASTM 51261 Practice for calibration of routine dosimetry systems for radiation processing
• ISO/ASTM 51707 Guide for estimation of measurement uncertainty in dosimetry for radiation processing
• ISO/IEC 17025 General requirements for the competence of testing and calibration laboratories [Standard in French]

ASTM E1026-13 history

• 2013 ASTM E1026-13 Standard Practice for Using the Fricke Dosimetry System
• 2004 ASTM E1026-04e1 Standard Practice for Using the Fricke Reference-Standard Dosimetry System
• 2004 ASTM E1026-04 Standard Practice for Using the Fricke Reference Standard Dosimetry System
• 2003 ASTM E1026-03 Standard Practice for Using the Fricke Reference Standard Dosimetry System
• 1995 ASTM E1026-95 Standard Practice for Using the Fricke Reference Standard Dosimetry System