ASTM E1650-97e1 PDF

Full title and description

Standard Practice for Use of Cellulose Acetate Dosimetry System — Designation: ASTM E1650-97e1. This practice describes the preparation, handling, irradiation, and readout procedures for cellulose acetate film dosimeters (cellulose triacetate, CTA, and cellulose diacetate, CDA) used to measure absorbed dose from photon and electron radiation in terms of absorbed dose to water.

Abstract

ASTM E1650-97e1 provided a routine, practical procedure for using CTA/CDA film dosimeters for dose measurement and one-dimensional dose mapping in industrial radiation processing and research. It specified applicable dose and energy ranges, recommended spectrophotometric/densitometric readout methods, calibration practice traceable to standards, and cautions about environmental and irradiation-condition effects on dosimeter response. The practice was later withdrawn and incorporated into subsequent ISO/ASTM consolidated documents.

General information

• Status: Withdrawn (withdrawal recorded in 2002); historically superseded by the ISO/ASTM consolidated practice for cellulose acetate dosimetry.
• Publication date: Original designation E1650-97 (1997) with editorial correction e1 (archive/publication entry dated October 6, 1999).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: 17.240 (Radiation measurements and dosimetry).
• Edition / version: E1650-97e1 (editorial correction E01 to the 1997 edition).
• Number of pages: Approximately 7–8 pages (historical archival listings show 7–8 pages depending on formatting).

Scope

This practice covered procedures for using cellulose acetate film dosimeters (untinted and tinted CTA/CDA) to measure absorbed dose from photons and electrons. It specified typical absorbed-dose ranges (untinted CTA/CDA and tinted versions), applicable dose rates and radiation energies, allowable irradiation temperatures, and limits on environmental effects. The practice applied to routine dosimetry for industrial processing (dose mapping, sterilization, polymer modification, and related applications) where CTA/CDA films are suitable.

Key topics and requirements

• Definition and types of cellulose acetate dosimeters (CTA, CDA) and distinction between untinted and tinted films.
• Recommended absorbed-dose ranges and applicable energy/rate windows for photons and electrons.
• Preparation, handling, and storage procedures to preserve dosimeter integrity and response.
• Spectrophotometric, densitometric, or photometric readout methods and recommended wavelengths/readout calibration.
• Calibration and traceability: use of calibration curves or response functions traceable to national/international standards and separate calibration for different radiation types when necessary.
• Considerations for environmental and irradiation-condition effects (temperature, humidity, dose rate) and guidance to calibrate under representative conditions.

Typical use and users

Primary users included radiation-processing facilities, dosimetry laboratories, quality-control engineers in sterilization and polymer-processing industries, and researchers conducting dose mapping or process validation. Typical applications were industrial electron-beam and gamma processing, sterilization validation for medical devices and packaging, polymer modification studies, and routine absorbed-dose monitoring where CTA/CDA film dosimeters are appropriate.

Related standards

ASTM E1650-97e1 has been superseded and consolidated into later ISO/ASTM practice documents (ISO/ASTM 51650 series). Other related ASTM/ISO dosimetry practices and guides include standards and guides for alanine-EPR dosimetry, calorimetric dosimetry, gamma and electron-beam dosimetry practices, and general dosimetry terminology and uncertainty estimation (examples historically referenced by the E61 dosimetry committee).

Keywords

cellulose acetate, cellulose triacetate (CTA), cellulose diacetate (CDA), dosimetry, absorbed dose, dose mapping, spectrophotometry, densitometry, electron beam, gamma radiation, calibration, radiation processing.

FAQ

Q: What is this standard?

A: ASTM E1650-97e1 is a standard practice that described the use of cellulose acetate film dosimetry systems (CTA and CDA) for measuring absorbed dose from photon and electron irradiation. It provided procedures for dosimeter handling, irradiation, readout, and calibration.

Q: What does it cover?

A: It covers preparation and use of CTA/CDA film dosimeters, applicable dose and energy ranges, dose-rate and temperature considerations, spectrophotometric/densitometric readout methods, and calibration/traceability recommendations for routine radiation-processing dosimetry.

Q: Who typically uses it?

A: Users include radiation processing facilities, dosimetry and calibration laboratories, quality and regulatory personnel in sterilization and materials-processing industries, and researchers needing routine absorbed-dose measurement or dose mapping.

Q: Is it current or superseded?

A: ASTM E1650-97e1 was withdrawn (withdrawal recorded in 2002) and its content was consolidated into later ISO/ASTM practice documents (ISO/ASTM 51650 series). For current, authoritative procedures consult the active ISO/ASTM publications that replaced E1650.

Q: Is it part of a series?

A: Yes — it was developed within the ASTM committee structure covering radiation processing and dosimetry (E61 subcommittee) and is part of a family of dosimetry practices and guides (including alanine-EPR, calorimetric methods, gamma/electron-beam dosimetry practices, and related guides and terminology). Many of these practices have been harmonized into ISO/ASTM consolidated documents.

Q: What are the key keywords?

A: Cellulose acetate, CTA, CDA, dosimetry, absorbed dose, spectrophotometry, densitometry, dose mapping, electron-beam, gamma irradiation, calibration.