A, sample making: sample making in accordance with GB6566-2010 for sampling, sample making, the final test sample fineness needs to be <0.16mm. The purpose of sampling is to make the physical properties of the sample and the physical properties of the standard material is basically the same, in order to ensure that the relative results of the measurement according to the comparability. Therefore, the sampling process has a great impact on the measurement results, should be in strict accordance with the standard method and quality requirements.
Two, warm-up: refers to allow the instrument to run for a period of time, but at this time, regardless of measurement or other behavior can not be introduced as a conclusion of the report, to be discarded. Its purpose is to allow the instrument to run better in a stable state.
Third, the sample measurement:
1 will be the instrument for warm-up operation;
2 sample placement: the sample will be placed on top of the detector with the detector, the sample and the detector required to be basically coaxial;
3 into the analytical program, the use of "File"→"New Test" correctly set the control method and control volume, click "OK" to generate a blank test document.
4 Use "Edit" → "Sample Info" to set the sample information.
5 Confirm that the device is connected and running normally, and click "Spectrum" → "Start" to start the measurement.
6 After the measurement, save the spectrum data, set the sensitive area for analysis, and analyze the sample using "Tools" → "Sample Analysis".
7 Confirm the results of the analysis using Tools → Fit Display.
8 Preview and print the report.
Four, sampling time selection criteria
Please pay attention to the requirements of the relevant state policies and regulations, strictly subject to the requirements of state regulations. Under the premise of meeting the requirements of national regulations, we suggest that: the sampling time for all samples should not be less than 2000s, but not more than 24h. For samples with high nuclide content, the measurement time can be relatively shortened; for samples with low nuclide content, the sampling time should be extended to 10000s or longer. You can set the sampling time to 20000s or longer, and then pay attention to observe the sample spectra during the sampling process, when the sample spectra have been basically finalized, you can stop sampling and save and calculate. If the calculation result is in critical value, please extend the measurement time appropriately to make the result more reliable.
Fifth, the best use of the instrument conditions
This instrument is prohibited to work below 0 ℃ and above 50 ℃. Users are recommended to use the instrument under the environment of 23±2℃, 50%±10% humidity and 2℃ temperature fluctuation. This is also the test environment when the instrument is scaled from the factory. If the user uses it at room temperature, it is necessary to scale it at room temperature, i.e., to ensure that the environmental conditions at the time of testing and the environmental conditions at the time of scaling are consistent.
Sixth, re-scaling cycle
For new machines, due to the unstable efficiency of the photomultiplier tube, it is recommended to run the machine for one week to make the equipment fully aging and stable. During the first 6 months, in a constant temperature laboratory with air conditioning, the scale will be performed once every two months; if it is a non-constant temperature laboratory, the scale will be performed once every month. For machines with no maintenance records for 6 consecutive months, the scale can be performed once every 3 months if it is an air-conditioned thermostatic laboratory; if it is a non-thermostatic room, the scale must still be performed once every month.