Doza RPOGRESS-GAMMA Manual do utilizador - Página 8
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4.5.2 Testing
Turn the gamma-spectrometer on (computer and power supply unit) and wait until warming up
for 30 minutes.
Start «Progress» software and initiate viewing mode of the apparatus spectrum of gamma-
spectrometer.
Place the calibration source (
energy calibration mode in accordance with the user manual for the software «Progress». A live
spectrum will appear on the screen, typical shape of the spectrum is shown in the Figure 4.1.
Figure 4.1 – Apparatus spectrum of the (
4.5.3 Performing measurements
4.5.3.1 Measurements of the calibration source
1) Place the calibration source (
calibration.
2) Start measurement in the energy calibration mode. During measurement process the software
shows on the screen positions (channel numbers n1 and n2) determined from the calibration source
spectrum (these positions correspond to complete absorption peaks in apparatus spectra of
137
radionuclides
Cs and
energy range from 600 to 720 keV.
3) After 150 seconds make a record in the row 1 of the table 4.2. In the columns «Reference
mark 662 keV» and «Reference mark 1461 keV» channel numbers are to be recorded corresponding to
positions of complete absorption peaks, and in the column «Test count rate» – the value of measured
test count rate.
Table 4.2 – Results of the energy calibration by source (
Number of
Reference mark 662 keV
measurement
4) Perform at least five successive measurements of calibration source and record the results
into the rows of the table 4.2.
4.5.3.2 Measurements of background
1) Remove calibration source out of the detector unit and start spectrum acquisition in the
background measurements mode. During measurement the software shows on the screen values of the
background count rate in the current and previous measurements.
137
40
Cs+
137
137
Cs+
40
K: 662 and 1461 keV, accordingly) and the measured count rate within
FVKM.412131.002-03RE
K) in standard position and start measurement in the
40
Cs+
K) source measured by gamma-spectrometer
40
K) on the detector unit for performing energy
137
40
Cs +
Reference mark 1461 keV
8
K).
Test count rate