Doza RPOGRESS Podręcznik użytkownika - Strona 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

Cs+

137

Cs+

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

Cs+

K) source measured by gamma-spectrometer

K) on the detector unit for performing energy

137

Cs +

Reference mark 1461 keV

K).

Test count rate