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• Press « » twice, the cursor « » move to the section «BACKGROUND» (Screen 3).
• Press «SELECT», the screen of background control appears on the display (screen 4).
Button « » moves the cursor «
«CHANGE» button switches on the appropriate function, what is shown by the «tick» « ».
• To carry put the background estimation you need to move the cursor to « » to the line
«EVALUATE» and press the «CHANGE» button (screen 5). The screen 6 with an empty
table appears, where the figures «1», «2», «3», «4», «5» determine the number of obser-
vation points, where you need to estimate the background.
Now you need to choose the first observation point and place the product there, in
accordance with the instructions given in the art. 2.3.3 and 2.3.4.
• Press the «EVALUATE» button, the screen 7 appears on the display and the
background measurement cycle starts. After the first cycle the screen will conform to the
mode «MEASURE» (screen 8). To get the accurate results of the background
measurement you need to carry out 8 cycles of measurement with averaging of the
results. After about 4 min. the background estimation in the first point is complete. The
display shows the screen 9 with the results in the first line: in the left – column the value
of the background dose rate in the first measuring point, in the right column – the flux
density value.
Note - You can stop the cycle of background measuring. To do this, press «RETURN»,
and the background measurement cycle is interrupted, the screen 6 appears.
• Move the product to the second point of measurement.
Press «EVALUATE» and wait the completion of the cycle «EVALUATE». The numbers
in the second line – are the results in the second point of measurement.
To obtain the accurate results of the background you need to perform the similar
observations at 5 points (screen 11).
Note - You can reduce the number of measurement points, for this you should press
the «BKGND» without waiting for the fifth cycle of measurement. But this reduces the
results accuracy.
• Get 5 readings, press «BKGND» the screen 12 appears on the display.
• To return to the «main screen» of «MENU» press «RETURN», the screen 13 appears
on the display.
• Press «RETURN», the screen RD1008 appears on the display and the «MEASURE»
taking the background into account.
• After completing the first cycle of the mode «MEASURE» taking the background into
account the, screen 14 appears on the display, where
a) background dose rate, calculated on the points of the background evaluation;
b) the difference between the dose rate and dose rate of the background;
c) the background flux density, calculated on points of the background estimation.
d) the difference between the current flux density and flux density of the background;
In the subsequent cycles, the current values are averaged in accordance with the
algorithm of the product operation.
If the background evaluation was carried out under the mode «SEARCH», then instead
of the screen 6 the screen 15 will appear turn with an empty table for the estimation results,
but there will be one column with the numbers in it, not two ones. This table will be filled
during the background evaluation (screen 16).
::::::::::
BACKGROUND
1
2
3
4
5
● EVALUATE
15
» to the position «OFF», «ON», «EVALUATE». The
:::
BKGND ●
::::::::
:::
BACKGROUND
1
0,09
2
0,12
....
3
0,10
4
0,10
5
0,12
● EVALUATE
BKGND●
16
18
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