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JJF 1002-2010 The rules for drafting national metrological verification regulation, JJF 1001-2011 General terms in metrology and their definitions and JJF 1059.1-2012 Evaluation and expression of uncertainty in measurement jointly constitute the basic of specifications supporting the development of this regulation.
This regulation is a revision of JJG 393-2003 X and gamma radiation dose equivalent (rate) meters and monitors used in radiation protection, with references to GB/T 4835.1-2012 Radiation protection instrumentation — Ambient and/or directional dose equivalent (rate) meters and/or monitors for beta, X and gamma radiation — Part1: Portable workplace and environmental meters and monitors, GB/T 12162.1 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photon energy — Part 1: Radiation characteristics and production methods, GB/T 12162.2 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photo energy — Part 2: Dosimetry for radiation protection over the energy ranges 8 keV to 1.3 MeV and 4 MeV to 9 MeV, and GB/T 12162.3 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photo energy — Part 3: Calibration of area and personal dosemeters and the measurement of their response as a function of energy and angle of incidence.
The following main technical changes have been made:
1. The name of the regulation has been revised from "X and gamma radiation dose equivalent (rate) meters and monitors used in radiation protection" to "portable ambient dose equivalent (rate) meters and monitors for X and gamma radiations" with respect to GB/T 4835.1-2012.
2. "Overload characteristic" and "alarm threshold error" have been removed from the verification items, and "response as a function of energy/angle (energy/angle response)" has been modified as "response as a function of energy (energy response)".
3. The requirements of measurement performance and verification methods for the items "relative inherent error", "repeatability" and "response as a function of energy" shall be modified accordingly with respect to the technical requirements and test methods of GB/T 4835.1-2012.
4. "Measurement method and calibration factor of response as a function of energy/angle of incidence" has been added in the annexes.
The previous edition of this regulation is as follows:
——JJG 393-2003;
——JJG 393-1985 and JJG 483-1986.
Verification regulation of portable ambient dose equivalent (rate) meters and monitors for X and γ radiations
1 Scope
This regulation is applicable to the initial verification, subsequent verification and in-service inspection of portable ambient dose equivalent (rate) meters and monitors for X and γ radiations. Ambient dose equivalent H*(10) and dose equivalent rate (10) are generated by X and γ radiations in external exposure, and the X and γ radiations energy ranges from 80 keV to 1.5 MeV.
This regulation is not applicable to the verification of passive measuring devices such as film dosimeters, thermoluminescent dosimeters or quartz fibre electrometers.
2 References
The following document is referenced in this regulation:
JJF 1001 General terms in metrology and their definitions
JJF 1035 Metrological terms and their definitions for ionizing radiation
GB/T 4835.1-2012 Radiation protection instrumentation — Ambient and/or directional dose equivalent (rate) meters and/or monitors for beta, X and gamma radiation — Part 1: Portable workplace and environmental meters and monitors
GB/T 4960.1 Glossary of nuclear science and technology terms —
Part 1: Nuclear physics and nuclear chemistry
GB/T 4960.6 Glossary of terms for nuclear science and technology — Part 6: Nuclear instrumentation
GB/T 12162.1 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photo energy — Part 1: Radiation characteristics and production methods
GB/T 12162.2 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photo energy — Part 2: Dosimetry for radiation protection over the energy ranges 8 keV to 1.3 MeV and 4 MeV to 9 MeV
GB/T 12162.3 X and gamma reference radiation for calibrating dosemeters and doserate meters and for determining their response as a function of photo energy — Part 3: Calibration of area and personal dosemeters and the measurement of their response as a function of energy and angle of incidence
ICRU Report 47:1992 Measurement of dose equivalent from external photon and electron radiations
For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
3 Terms and meteorological units
3.1 Terms
For the purposes of this regulation, the terms and definitions given in JJF 1001, JJF 1035, GB/T 4960.1 and GB/T 4960.6 apply.
3.1.1
ambient dose equivalent H*(10)
dose equivalent at a point in a radiation field that would be produced by the corresponding expanded and aligned field in the ICRU sphere at a depth of 10 mm on the radius opposing the direction of the aligned field
3.1.2
point of test [of a dose equivalent (rate) meter]
point at which the conventional quantity value is determined and at which the reference point of the dose equivalent (rate) meter is placed for measurement and test purposes
3.2 Measurement unit
3.2.1 Ambient dose equivalent H*(10) is measured in Sievert, expressed as Sv, where 1 Sv = 1 J·kg-1.
3.2.2 The measurement unit of the air kerma Ka is Gray, expressed as Gy, where 1 Gy = 1 J·kg-1.
3.2.3 Other quality values given in this regulation are in units in accordance with the International System of Units (SI). In addition, the radiation energy may be measured in electron volt, expressed as eV, where 1 eV = 1.602 × 10-19 J.
4 General
Portable ambient dose equivalent (rate) meters and monitors for X and γ radiations refer to portable radiation protection measuring instrument used to measure the ambient dose equivalent (rate) produced in X and γ radiations in external exposure. This kind of instrument can be used independently without relying on external fixed facilities such as external power supply, bracket and data network. The structure comprises at least one detecting component and one measuring component, which can be assembled as a whole or connected with each other directly or by cables and wireless signals. The detecting component contains radiation detectors inside, such as ionizing chambers, counter tubes, scintillation detectors, semiconductor detectors. It generates electrical signal in certain form under the action of photons, which is measured and indicated by the measuring component.
In addition to the above functions, the portable ambient dose equivalent (rate) monitor also includes an alarm (audible or acousto-optic alarm) component, so that it can generate an audible (and flash) signal associated with the ambient dose equivalent (rate) level during the measurement, and the user can roughly estimate the ambient dose equivalent (rate) level according to the correlation (threshold setting or alarm frequency).
5 Measurement performance requirements
The measurement performance of portable ambient dose equivalent (rate) meters and monitor for X and γ radiations shall meet the requirements of Table 1.
Table 1 Measurement performance requirements
Measurement performance Technical requirements Measuring conditions
Relative inherent error -15% ~ +22% At least 3 quantities covered within the effective measuring range
Repeatability 1.4 (16 - H/H0)% H0 ≤ H ≤ 11 H0
1.255 (16 - H ̇/H ̇_0)% H ̇_0 ≤ H ̇ ≤ 11H ̇_0, response time ≤ 10 s
Energy response -23% ~ +43% 80 keV ~ 1.5 MeV
Note 1: The effective measuring range of dose equivalent rate must include 10 μSv/h, and the dose equivalent must include 100 μSv.
Note 2: H0 and H ̇_0 respectively refer to the lower limit values of effective measuring range of dose equivalent and dose equivalent rate.
6 General technical requirements
6.1 Appearance
The instrument appearance shall be intact, and there shall be no defects such as rust, crack and damage, as well as mechanical damage compromising normal service performance. The function buttons set on the control panel or system interface can be available for the functions accordingly.
6.2 Markings
The model, number, manufacturer and other markings of the instrument shall be clearly distinguishable. The detector position and reference direction of the instrument must be clearly indicated on the exterior of the instrument body.
Introduction ii
1 Scope
2 References
3 Terms and meteorological units
3.1 Terms
3.2 Measurement unit
4 General
5 Measurement performance requirements
6 General technical requirements
6.1 Appearance
6.2 Markings
6.3 Functional characteristics
7 Control of measuring instrument
7.1 Verification conditions
7.2 Verification items
7.3 Verification method
7.4 Treatment of verification results
7.5 Verification period
Annex A Recommended format of verification record
Annex B Recommended format for inside page of verification certificate
Annex C Recommended format for inside page of verification result notice
Annex D Reference radiation characteristics and correlation conversion coefficients
Annex E Statistical fluctuation
Annex F Measurement and expression of energy/angle of incidence response
