JJF 1743-2019 English PDF

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JJF 1743-2019: Calibration Specification of Water Absorbed Dose of Dosimeters with Ionization Chambers as Used in Radiotherapy
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1743-2019	419	Add to Cart	4 days	Calibration Specification of Water Absorbed Dose of Dosimeters with Ionization Chambers as Used in Radiotherapy	Valid

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Basic data

Standard ID: JJF 1743-2019 (JJF1743-2019)
Description (Translated English): Calibration Specification of Water Absorbed Dose of Dosimeters with Ionization Chambers as Used in Radiotherapy
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A58
Classification of International Standard: 17.240
Word Count Estimation: 18,145
Date of Issue: 2019
Date of Implementation: 2019-12-27
Issuing agency(ies): State Administration for Market Regulation

JJF 1743-2019: Calibration Specification of Water Absorbed Dose of Dosimeters with Ionization Chambers as Used in Radiotherapy

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification of Water Absorbed Dose of Dosimeters with Ionization Chambers as Used in Radiotherapy National Measurement Technical Specification of the People's Republic of China Ionization chamber dosimeter water absorption for radiotherapy Dose calibration specifications 2019-09-27 release 2019-12-27 Implementation Issued by the State Administration of Market Supervision and Administration Ionization chamber dosimeter water absorption for radiotherapy Dose calibration specifications Centralized unit. National Technical Committee on Ionizing Radiation Measurement Drafting unit. Chinese Academy of Metrology Beijing Academy of Metrology and Testing Science Shanghai Institute of Metrology and Testing Technology This specification entrusts the National Ionizing Radiation Measurement Technical Committee to interpret The main drafters of this specification. Wang Kun (Chinese Academy of Metrology) Jin Sunjun (Chinese Academy of Metrology) Luo Chen (Beijing Institute of Metrology and Testing Science) Chen Jianxin (Shanghai Institute of Metrology and Testing Technology) Participating drafters. Yang Xiaoyuan (Chinese Academy of Metrology) Lu Xun (Shanghai Institute of Metrology and Testing Technology) Fan Yaodong (Beijing Institute of Metrology and Testing Science)

table of Contents

Introduction (Ⅱ) 1 Scope (1) 2 References (1) 3 Terms and units of measurement (1) 4 Overview (1) 5 Metrological characteristics (2) 6 Calibration conditions (2) 7 Calibration items and calibration methods (3) 8 Expression of calibration results (5) 9 Recalibration time interval (5) Appendix A. The content and format of the calibration certificate (6) Appendix B Examples of uncertainty assessment of calibration factors (7) Appendix C Measurement of composite effects and polarization effects (10) Appendix D Examples of calibration factors for absorbed water dose (11) Appendix E Radiation Quality Correction Factor (12)

Introduction

The water absorption dose calibration of the ionization chamber dosimeter for radiotherapy is to meet the measurement needs in the field of radiotherapy Seeking, compared with the original measurement system, it can reduce the uncertainty of the measurement of the water absorption dose of working measuring instruments, and makes me The radiation dose measurement system in China is consistent with international standards. This specification mainly refers to IAEATRS398 "Determination of Absorbed Dose of Water for External Radiation Therapy" (Absorbed DoseDeterminationinExternalBeamRadiotherapy) requirements for the calibration of the absorbed dose of water in the ionization chamber, And the performance of YY/T 0976 "Ionization Chamber Dosimeter for Radiation Therapy of Medical Electrical Equipment" for the ionization chamber dosimeter Claim. This specification is the first release. Calibration specification for water absorbed dose of ionization chamber dosimeter for radiotherapy

1 Scope

This specification applies to ionization chamber dosimeters for radiotherapy for water absorption in 60Co gamma rays and accelerator photon beams Dose calibration, the photon energy range is (1.25 ~ 25) MeV, and the dose rate range is (0.01 ~ 10) Gy/min. school The post-calibration ionization chamber dosimeter can be used to calibrate the water absorption dose of external radiation therapy radiation sources, including MVX-ray beam, Electron beam, proton beam and heavy ion beam.

2 Reference documents

This specification refers to the following documents. YY/T 0976 Medical electrical equipment ionization chamber dosimeter for radiotherapy IAEATRS398 AbsorbedDoseDetermination inExternalBeamRadiotherapy) For dated reference documents, only the dated version applies to this specification; for those without date references The latest version (including all amendments) is applicable to this specification.

3 Terms and units of measurement

3.1 Terminology 3.1.1 Calibration factor The quotient of the reference value divided by the indicated value. 3.1.2 Reference point The point where the ionization chamber coincides with the reference value when calibrating the ionization chamber. Note. The reference point of the cylindrical finger ionization chamber is on the central axis of the cavity of the ionization chamber, and the reference point of the flat plate ionization chamber is in the front window of the ionization chamber Inner surface. 3.1.3 Leakage current The current generated by the ionization chamber dosimeter on the signal channel is not the current generated by ionization in the sensitive volume. 3.2 Unit of measurement 3.2.1 Water absorbed dose Ionizing radiation grants energy per unit mass of water in Joules per kilogram (J/kg), the proper name for Gy. 3.2.2 Dose rate of water absorption The increment of water absorbed dose per unit time, the commonly used unit is Gray per minute (Gy/min).

4 Overview

The ionization chamber dosimeter for radiotherapy is used for the transmission of radiation dosimetry and other application fields such as medical radiotherapy The measurement of the radiation dose is mainly composed of the ionization chamber and the measurement unit. The ionization chamber is a cavity ionization chamber. ......

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