ASTM ISO ASTM 51631-20e1 PDF

Full title and description

Practice for use of calorimetric dosimetry systems for dose measurements and dosimetry system calibration in electron beams — published jointly as ISO/ASTM 51631:2020 and issued by ASTM as E1631-20E01 / ASTM 51631-20e1. This practice provides procedures for preparation, operation and application of semi-adiabatic calorimetric dosimeters used to measure absorbed dose and to calibrate routine dosimetry systems in industrial electron-beam irradiation facilities.

Abstract

This standard describes the use and calibration of calorimetric dosimetry systems (Type II calorimeters) for electron-beam radiation processing. It covers calorimeter construction and materials, measurement of temperature rise to determine absorbed dose (usually reported as dose to water), recommended calibration approaches using transfer standards, typical dose and energy ranges, and relevant influence quantities and limitations. The practice is intended for qualification of electron irradiation facilities, routine checks of operating parameters, and calibration/validation of other dosimetry systems in electron beams.

General information

• Status: Active (published as ISO/ASTM 51631:2020; ASTM designation E1631-20E01 / 51631-20e1; note that national catalog status may vary by country/catalogue).
• Publication date: 2020 (ISO/ASTM 51631:2020; ASTM editorial designation and amendment history includes E1631-20E01 with updates referenced in 2024).
• Publisher: ASTM International in cooperation with ISO (published as a joint ISO/ASTM standard).
• ICS / categories: 17.240 (Radiation measurements).
• Edition / version: ISO/ASTM 51631:2020 (ASTM designation E1631-20E01; sometimes referenced as ASTM 51631-20e1).
• Number of pages: 9–10 pages (typical published document length is listed as 9 or 10 pages depending on publisher format; ASTM lists 10 pages).

Scope

The practice covers preparation and use of semi-adiabatic calorimetric dosimetry systems for measurement of absorbed dose and for calibration of routine dosimetry systems when irradiated with electron beams for radiation processing. It applies to electron beams in the approximate energy range 1.5 to 12 MeV, typical absorbed-dose ranges from about 100 Gy up to ~50 kGy (depending on materials and conditions), and average absorbed-dose rates generally greater than about 10 Gy·s−1. The document is intended to be read in conjunction with related dosimetry practices and reports.

Key topics and requirements

• Definition and classification of calorimetric dosimeters (Type II) and their role as internal or transfer standards rather than primary standards.
• Calorimeter designs and typical absorbing materials (graphite, polystyrene, water-filled vessels) and considerations for thickness relative to electron range.
• Measurement principle: determination of absorbed dose from temperature rise and conversion to dose-to-water where applicable.
• Recommended energy and dose-rate ranges for valid use (≈1.5–12 MeV; average dose rates commonly >10 Gy·s−1).
• Calibration approach: use of transfer standards and comparison calibrations to establish calorimeter response; limitations and uncertainty considerations.
• Guidance on using calorimeters for facility qualification, routine checks, and calibration of other dosimetry systems in conveyor or stationary broad-beam arrangements.

Typical use and users

Users include industrial radiation-processing facilities (electron accelerator operators), dosimetry laboratories, calibration and quality assurance personnel, researchers working with electron-beam irradiation, and regulators or third-party auditors verifying absorbed-dose delivery. Typical uses are facility qualification, periodic performance checks, transfer-calibration of routine dosimeters, and establishing traceable in-house dose measurements.

Related standards

Referenced and related documents include ASTM Practice 52628 (classification and use of dosimeters), ASTM 51649 (guidance for using dosimetry in electron accelerator facilities), ASTM Practices E666 and E668 for dose equivalence calculations, and ICRU reports (e.g., ICRU Report 80) for calorimetry background and radiation-processing dosimetry guidance. The 2020 version revises or supersedes earlier ISO/ASTM 51631 editions (e.g., 2013).

Keywords

calorimetric dosimetry; calorimeter; absorbed dose; dosimetry calibration; electron beam; radiation processing; electron accelerator; dose-to-water; polystyrene; graphite; transfer standard; ICS 17.240.

FAQ

Q: What is this standard?

A: It is a practice that gives procedures and guidance for using semi-adiabatic calorimetric dosimetry systems to measure absorbed dose and to perform routine dosimetry-system calibrations in electron-beam irradiation facilities (published jointly as ISO/ASTM 51631:2020; ASTM designation E1631-20E01 / ASTM 51631-20e1).

Q: What does it cover?

A: It covers calorimeter construction/materials, measurement of temperature rise to derive absorbed dose (commonly reported as dose-to-water), calibration by comparison with transfer standards, applicable electron energies (~1.5–12 MeV), typical dose ranges (~100 Gy to ~50 kGy depending on material), and recommended uses for facility qualification and routine checks.

Q: Who typically uses it?

A: Industrial electron-beam irradiation facilities, dosimetry and calibration laboratories, QA personnel, and researchers involved in radiation processing and dosimetry—anyone needing reliable calorimetric measurements or traceable calibration of routine dosimeters in electron beams.

Q: Is it current or superseded?

A: The joint ISO/ASTM version is dated 2020 (ISO/ASTM 51631:2020) and is listed with active ASTM designation E1631-20E01 (document history includes editorial updates); national catalogue statuses may differ, so check your local standards body for adoption/withdrawal notices.

Q: Is it part of a series?

A: Yes — it is part of a suite of standards and practices for dosimetry in radiation processing and refers to and complements other ASTM/ISO dosimetry standards and ICRU reports that address reference and routine dosimetry methods.

Q: What are the key keywords?

A: Calorimetric dosimetry, calorimeter, absorbed dose, dosimetry calibration, electron beam, radiation processing, transfer standard, dose-to-water.