User manual

B) In the mode «MEASURE» taking the background into account the dose rate and

flux density evaluation is executed. But the display for each type of radiation output at the

same time shows two indications: for gamma radiation - the dose excess above the

background dose rate and the background dose rate value for beta-radiation – this is the

flux density excess over the flux density of the background and the flux density of the

background value.

Dose rate of the background and the background flux density are calculated in ad-

vance during the evaluation of the background (see art.). In other respects these variants

are the same.

This variant is very convenient during performing the inspection inside premises

when you need to know how much the measurements results inside differ from the ones

outdoors or how much the results of the target differ from the natural radiation background

in the workplace, for example, during the radiation control of money.

The mode «MEASURE» with the background is turned on in the section

«BACKGROUND» (see art. 1.3.3.3) of the «MENU». This option can be off and on again,

and the background values get saved and can be used in the future.

We remind once again, that the display shows not the absolute values in this mode,

but the excess of the background value.

1.3.3.2 The mode «SEARCH»

In the mode «SEARCH» the summary evaluation of gamma- and beta-radiation, and

the averaging with the results of previous cycles and the output of the results onto the

display are conducted.

The display shows the total number of particles detected with the gamma-detector

and the beta-detector during the evaluation and threshold set for this mode.

Execution of the mode «SEARCH» is possible in two variants: without the

background and taking the background into account.

a) In the mode «SEARCH» without the background the summary gamma- and beta-

radiation evaluation is executed and the output of one result onto the display - the

summary amount of particles detected with the gamma-detector and the beta-detector

during the evaluation period.

b) In the mode «SEARCH» with the background the summary evaluation of gamma-

and beta-radiation is executed. But the display shows two results: – the excess of the dose

rate above the background dose rate and the summary amount of particles detected with

the gamma-detector and the beta-detector during the background evaluation.

This option is useful when you carry out the inspecting of premises when you need to

know how much the measurements results inside the building differ from the results in the

open space or how much results of the controlled target differ from the natural radiation

background in the workplace, for example, during the radiation control of money.

::: GAMMA:: BKG 0,10

0,12 B 0,30

■ ::: BETA :::BKG 30

9 B 10

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