21
6.4.3
Radionuclide matter composition identification mode
To enter the radionuclide matter composition identification mode select the "Quick Identify"
option
(6.10 (1)) in the window displaying operation modes of the built-in detection unit "Detector
NaI [BDG1]".
1)
2)
3)
Figure 6.10
Instrument will enter the radionuclide matter composition identification mode "Quick
Identify". LCD will display average count rate of photon radiation impulses being registered.
Graphical scale of gamma channel load will be displayed on the LCD simultaneously with digital
count rate indication. Move the instrument as close as necessary to the tested object so that the count
rate by detection unit is within 200-20000 cps. It corresponds to green area on the scale (Figure 6.10
(2)). Press OK key to start spectrum accumulation and identification.
If gamma channel load is sufficient (within range 200-20000 cps), the instrument will take
about 150-300 s to display the identification result in the upper LCD area. If gamma channel load is
less or more than stated one, then the instrument will take more time to identify.
During spectrum accumulation the lower LCD area displays the image of accumulated
spectrum in progress and analogue scale of time passing from the spectrum start (Figure 6.10 (3)).
LCD renews spectrum every 10 s. At that the BDG1 every 10 s will attempt to identify nuclides
accumulated during this time.
When instrument accumulates statistical data enough for radionuclide matter composition
identification attempt, the identification results will be immediately displayed in the upper LCD area,
Figure 6.10 (3).
Identification mode menu enables the following functions:
"
Clear Statistic
" - manual statistics reset enables reset of measurement data buffer
accumulated by the instrument and start of the new spectrum accumulation;
"
View Library
"
of the radionuclides;
"
Set Absorber
": to obtain more reliable results of the radionuclide composition
identification it is necessary to enter the security settings:
o
"Height, mm" – set the material thickness, in mm;
o
"Material" – set the material.
