JJF 1133-2005 Calibration specification for gold content analyzer using X-ray fluorescence spectrometry JJF1133-2005 Standard download decompression password: www.bzxz.net
This specification applies to the calibration of gold content analyzer using X-ray fluorescence spectrometry.

National Metrology Technical Specification of the People's Republic of China JJF1133--2005
Calibration Specification of Gold Gauge Utilizing X - ray Fluorescence Spectrometry2005 - 04 -28 Issued
Implementation on 2005-07-28
Issued by the General Administration of Quality Supervision, Inspection and Quarantine J.IF 1133—2045
Calibration Specification of Gold Gauge Utilizing X - ray Fluorescence Spectrometry2005
JJF 1133-
This specification was approved by the General Administration of Quality Supervision, Inspection and Quarantine on April 28, 2005, and came into effect on July 28, 2005.
Responsible unit: National Technical Committee on Ionizing Radiation Measurement Drafting unit: National Standard Material Research Center, Beijing Institute of Metrology
China Institute of Atomic Energy
This specification is entrusted to the National Technical Committee on Ionizing Radiation Measurement to be responsible for the interpretation of this specification Main drafters:
Zhu Fuhu
Mao Zuxing
Kang Siqing
Participating drafters:
Huang Xiaojian
Li Jincheng
JJF 1133- -2005
(Beijing Institute of Computer Science)
(National Center for Standardization of Materials)
(China Institute of Atomic Energy)
(China Institute of Atomic Energy)
(Beijing Institute of Metrology)
References
Metrological Characteristics
Basic Error
Repeatability
4.3 Stability
Radiation Dose Rate
5 Calibration Conditions
5.1 Gold standard
Calibration environmental conditions
6 Calibration items and calibration methods
·General inspection
Basic errorwwW.bzxz.Net
Repeatability
Stability
Radiation dose rate
Expression of calibration results
Recalibration time interval
Appendix A Uncertainty analysis of calibration results
JJF11332005
1 Scope
JJF 1133—2005
Calibration specification for gold content analyzer using X-ray fluorescence spectrometry This specification is applicable to the calibration of gold content analyzer using X-ray fluorescence spectrometry. 2 References
This specification references the following documents:
JG 807—1993
EJ/T 767—1993
CB 4792—1984
GB 8703—1988
JJF1059—1999
"Measuring instruments using effective radiation sources"
X-ray fluorescence analyzer using radioactive sources
"Basic standard for radiation health protection"
"Radiation Protection Regulations"
"Evaluation and Expression of Measurement Uncertainty"
When using this specification, attention should be paid to using the currently valid versions of the above-mentioned references. 3 Overview
X-ray spectrometry gold content analyzer (hereinafter referred to as analyzer) is a non-destructive measuring instrument for samples. It uses a radiation source to irradiate the sample to generate characteristic X-rays, and then determines the gold content in the sample according to the intensity of its characteristic X-rays. The analyzer is mainly composed of a radiation source (including a radioactive source or a tube-excited X-ray radiation source), a detector, an electronic measuring component and a display printing device. The gold content value can be directly displayed. 4 Metrological characteristics
4.1 Basic error
The basic error is expressed as the absolute error of the gold content. Within the measurement range of gold content as low as %, the basic error limit of the analyzer should not exceed ±0.3%; within the measurement range of gold content less than 90%, the basic error limit of the analyzer should not exceed ±1.5%
4.2 Repeatability
Within the effective measurement range of the analyzer, its repeatability is expressed as the standard deviation of a single measurement value, which should not exceed 1/2 of the corresponding basic error value.
4.3 Stability
Within the effective measurement range, the maximum change of the indication relative to the initial value within 4h shall not exceed the corresponding basic error limit.
4.4 Radiation dose rate
When the source gate is opened or closed, the maximum radiation leakage equivalent rate at 5cm and 1m from the outer surface of the source is less than 2.5μSv/h and 0.25μSw/h respectively:
5 Calibration conditions
5.1 Gold standard
JJF 1133—-2005
The gold standard should be a national standard material, and its uncertainty should be less than 0.1%e5.2 Calibration environmental conditions
The atmospheric environment and power grid conditions during calibration should meet the following requirements. Ambient temperature: 15℃-35℃
Ambient relative humidity: less than 75%
Power supply voltage fluctuation: less than ±10%
6 Calibration items and calibration methods
6.1 General inspection
6.1.1 The analyzer must be marked with the manufacturer, model, number, date of manufacture and the license mark and number of the manufacturing measuring instrument:
6.1.2 The analyzer should have obvious ionization radiation marks. For analyzers using radioactive sources, the name of the nuclide, activity value and calibration date should be indicated, and the source window position should be clear. 6.1.3 All parts of the analyzer should be intact and firmly assembled. There should be no defects that affect the performance. 6.2 Basic Error
6.2.1 Use the gold standard sample to calibrate at least 3 calibration points (including the upper and lower limits) evenly distributed within the effective measurement range of the analyzer. You can also select actual common points according to user needs. 6.2.2 The number of measurements for each calibration point shall not be less than 10 times, and each measurement shall use the commonly used measurement time. The deviation of the calibration point is calculated by formula (1).
Where, ·… the average value of the instrument indication at the ith calibration point; X——the standard value of the gold standard sample at the ith calibration point. 6.3 Repeatability
6.3.1 This calibration shall be carried out by selecting 3 calibration points (including the upper and lower limits) within the effective measurement range of the analyzer.
Repeatability is expressed as the standard deviation of a single measurement. For the same: · The gold standard sample is measured continuously for 1D times. Each measurement 6.3.21
The commonly used measurement time shall be used, and the standard deviation of a single measurement shall be calculated according to formula (2). (x - 1)
wherein is the value indicated by the instrument for the first measurement;
x——the arithmetic half-mean of n measurements (n=10): 6.4 Stability
6.4,! Select any calibration point within the effective measurement range for measurement. (2)
6.4.2, record two groups of indications at an interval of 4h (each group is measured 10 times and the average value is taken), and the stability is calculated according to formula (3), U=xx.
x——the average value of the indication at the initial measurement;
X——the average value of the indication at the calibration point after 4h: 2
6.5 Radiation dose rate
JJF 1133—2005
Use a dose rate meter to measure the dose equivalent rate at a distance of 5cm or 1m from the surface of the source container. 7 Expression of calibration results
The calibration results should be reflected in the calibration certificate or calibration report. The calibration results in the calibration certificate or calibration report should include at least the following information:
a, title, such as "calibration certificate" or "calibration report"; b. Laboratory name and address;
c. Location of calibration (if not performed in the laboratory); d. Unique mark of the certificate or report (such as number), mark of each page and total number of pages: e. Name and address of the unit sending the calibration;
f. Description and clear mark of the object to be calibrated; B. Calibration period;
h. If it is related to the validity and application of the calibration results, the sampling procedure should be explained; Marking of the technical specifications based on the calibration, including name and code: i. Description of the calibration environment:
k. Description of the calibration results and their measurement uncertainty; 1. Signature, position or equivalent mark of the person issuing the calibration certificate and calibration report, and the date of issuance; m.Statement that the calibration result is valid only for the current calibration of the object being calibrated; n: meter Statement that no partial reproduction of the certificate or the sale is allowed without written approval of the laboratory. Evaluation and expression of measurement uncertainty - should comply with the requirements of JJF 1059-1999 "Evaluation and expression of measurement uncertainty".
8 Recalibration interval
It is recommended that the recalibration interval of the analyzer should not exceed 1 year. 3
Appendix A
, mathematical model
JIF 1133 2005
Uncertainty analysis of calibration results
E=xX.
Where X is the average value of the indication of the measured instrument;
X is the standard value of the gold standard.
2. Variance and sensitivity coefficient
Each term in the mathematical model is independent of each other, then
2. Sources of uncertainty
1. Uncertainty introduced
The standard uncertainty component introduced by the repeatability of the measured value of the instrument. Since each calibration point is measured once and the average is taken, it is expressed by the experimental standard deviation of the average value. Its measurement is listed in Table A-1. Table A-1
Then, = 0.02%.
2. Uncertainty introduced by I,
The standard uncertainty component introduced by the uncertainty of the gold standard &z, its expanded uncertainty is 0.1%, including factor h=3, then ±, = 0,03%
3. Standard uncertainty - stopwatch
The standard uncertainty list is shown in Table A-2. Table A - 2
Standard uncertainty components ()
IV. Uncertainty of the measured instrument
Resilience of the indication of the measured instrument
Uncertainty of the standard sample
The combined uncertainty u and the effective degrees of freedom are calculated by the following formula: 4
Standard uncertainty value
Degrees of freedom
V. Expanded uncertainty
JJF 1133—2005
1. = /± + u2 =0.036%
4 = 50
degrees of freedom, the coverage factor is obtained by looking up the distribution table: Given the setting level p=0.99, [
h = to.99 (50) = 2.68
Expanded uncertainty U=0.036%×2.68=0.10%5
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