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JJG 2044-2019 English PDF

Q: How long will the true-PDF of English version of JJG 2044-2019 be delivered?

Upon your order, we will start to translate JJG 2044-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Q: Can I share the purchased PDF of JJG 2044-2019_English with my colleagues?

Yes. The purchased PDF of JJG 2044-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

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Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

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Q: Should I purchase the latest version JJG 2044-2019?

Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 2044-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.

US$209.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
JJG 2044-2019: Metrological Instruments for Air Kerma of γ Rays
Status: Valid

JJG 2044: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJG 2044-2019	209	Add to Cart	3 days	Metrological Instruments for Air Kerma of γ Rays	Valid
JJG 2044-2010	399	Add to Cart	3 days	Verification scheme of metrological instruments for air kerma of γ rays	Obsolete
JJG 2044-1989	199	Add to Cart	2 days	Verification Scheme of Measuring Instruments for γ-Ray Exposure	Obsolete

Similar standards

GB/T 3222.1 JJG 188 JJF 1396 JJF 2044 JJF 2017 JJG 2043

Basic data

Standard ID: JJG 2044-2019 (JJG2044-2019)
Description (Translated English): Metrological Instruments for Air Kerma of �� Rays
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A58
Classification of International Standard: 17.240
Word Count Estimation: 9,939
Date of Issue: 2019
Date of Implementation: 2020-03-27
Issuing agency(ies): State Administration for Market Regulation

JJG 2044-2019: Metrological Instruments for Air Kerma of γ Rays

---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.
(γ-ray air specific release kinetic energy measuring instrument verification system table) Table of National Metrology Verification System of the People's Republic of China γ-ray air specific release kinetic energy measuring instrument 2019-09-27 release 2020-03-27 Implementation Issued by the State Administration of Market Supervision and Administration γ-ray air specific release kinetic energy measurement Apparatus verification system table Replace JJG 2044-2010 Centralized unit. National Technical Committee on Ionizing Radiation Measurement Drafting unit. Chinese Academy of Metrology This verification system table entrusts the National Ionizing Radiation Measurement Technical Committee to interpret The main drafters of this verification system table. Li Dehong (Chinese Academy of Metrology) Wang Kun (Chinese Academy of Metrology) Participating drafters. Yang Xiaoyuan (Chinese Academy of Metrology) Huang Jianwei (Chinese Academy of Metrology) Ye Yibo (Chinese Academy of Metrology)

Introduction (Ⅱ) 1 Scope (1) 2 Measurement standards (1) 2.1 γ-ray air specific release kinetic energy benchmark (1) 2.2 γ-ray reference radiation (1) 3 Measurement standards (2) 3.1 Standard device for therapeutic level gamma rays (2) 3.2 Protection level γ-ray standard device (2) 3.3 Environmental level gamma-ray standard device (2) 4 Working measuring instruments (3) 4.1 Therapeutic level dosimeter (3) 4.2 Protection level dose meter (3) 4.3 Environmental level dosimeter (3) 4.4 Medical treatment radiation source (3) 4.5 Measuring instruments using radioactive sources (3) 4.6 γ-ray flaw detector (3) 5 γ-ray air specific release kinetic energy measuring instrument verification system table block diagram (3)

Introduction

This verification system table is prepared according to JJF1104-2003 "Rules for Compiling National Measurement Verification System Table". This verification system table replaces JJG 2044-2010 "γ-ray air specific release kinetic energy measuring instrument", the main technical changes It is as follows. --- Added the expression of 137Cs γ-ray air specific release kinetic energy benchmark, the dose rate range is (1 × 10-3 ~ 10) Gy/h. The previous releases of this verification system table are. --- JJG 2044-2010; --- JJG 2044-1989. γ-ray air specific release kinetic energy measuring instrument verification system table

1 Scope

This verification system is suitable for the treatment level, protection level and environmental level γ-ray air specific release kinetic energy measuring instruments The value is passed. The verification system of γ-ray air specific release kinetic energy measuring instruments consists of measuring reference instruments, measuring standard instruments and tools As a measuring instrument composition, the composition and main measuring performance of the γ-ray air specific release kinetic energy standard are specified. A procedure for carrying out the transfer of measurement values from measuring standard instruments to working measurement instruments, indicating the best measurement for the transmission of measurement values Ability and value transfer methods. In the process of carrying out the γ-ray air specific release kinetic energy calibration project, this verification system can be used as The basis for the traceability of the value.

2 Measurement basis

γ-ray air specific release kinetic energy measurement reference instrument is used to reproduce and preserve the amount of γ-ray air specific release kinetic energy (Gy) Value, through the γ-ray reference radiation to the measurement standard equipment, working measurement equipment to transfer the value. 2.1 γ-ray air specific release kinetic energy benchmark The γ-ray air kerma reference group consists of 137Cs γ-ray air kerma reference and 60Co γ-ray air kerma The kinetic energy reference composition, which reproduces the air specific kinetic energy value in the γ-ray reference radiation field. 2.1.1 The 137Cs γ-ray air specific kinetic energy reference consists of a graphite cavity ionization chamber group and an ionization current measurement system. The graphite cavity ionization chamber group consists of a graphite cavity ionization chamber with an effective collection volume of (5 ~ 50) cm3; ionization current measurement The measuring system is composed of digital source meter, standard capacitance, electrometer and so on. 137Cs γ-ray air specific release kinetic energy reference measurement range The range is (1 × 10-3 ~ 10) Gy/h, and the extended uncertainty range is 0.50% ~ 0.70% (k = 2). 2.1.2 The 60Co gamma ray air specific release kinetic energy reference consists of a graphite cavity ionization chamber and an ionization current measurement system. stone The ink cavity ionization chamber group consists of a graphite cavity ionization chamber with an effective collection volume of (2 ~ 10) cm3; ionization current measurement The system consists of digital source meter, standard capacitance, electrometer, etc. Measurement range of 60Co gamma ray air specific release kinetic energy reference It is (1 × 10-2 ~ 1) Gy/min, and the extended uncertainty range is 0.54% (k = 2). 2.2 Reference radiation of gamma rays γ-ray reference radiation is mainly composed of the reference radiation field of 60Co or 137Cs radioactive source. The quasi-through γ-ray reference radiation should be used to carry out the value transmission to the standard equipment of the treatment level and the protection level, respectively. quasi- Straight beam reference radiation field includes irradiator, lead container, shutter, guide rail positioning system and detector alignment positioning system group The source can be included in the irradiator. The freely diverging reference radiation field consists of the radioactive source and the source holder, the guide rail positioning system and The detector is composed of a positioning system, and the radiation source must meet the requirements of a point source. 2.2.1 γ-ray reference radiation needs to meet the requirements for the reproducibility and value transfer of the air specific release kinetic energy reference value. Straight design, in the open source state, the share of scattered ray fluence in the uniform area at a distance of 100 cm from the source is not greater than 30%, and the uniformity is not small In 99% of the area, the cross section completely covers the detector to be tested, and the radiation field is not less than the vertical beam direction of the detector 2 times the outer diameter of the cross-section, the dose contribution of scattered radiation outside the radiation source at different distances does not exceed the total air kerma 3%. 2.2.2 Dose rate range of γ-ray reference radiation. The therapeutic level air specific release kinetic energy rate is about (1 × 10-2 ~ 10) Gy/min, the protective level air specific release kinetic energy rate is about (1 × 10-3 ~ 10) Gy/h. ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of JJG 2044-2019_English be delivered?

Answer: Upon your order, we will start to translate JJG 2044-2019_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of JJG 2044-2019_English with my colleagues?

Answer: Yes. The purchased PDF of JJG 2044-2019_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version JJG 2044-2019?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version JJG 2044-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.