Doza MKS-15D Snegir Benutzerhandbuch - Seite 6

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Table 1.1 - Display windows

Shutter is closed – measurement of

Button

"AEDR"

window

Turns the illumination on for 15 seconds. Pressing the button at the illumination on turns

Switches between "AEDR" and "AED"

display windows. When the button is

pressed for more than 5 seconds, the

"MODE"

dosimeter switches from autorestart mode

" -›!-› " to infinite acquisition mode " ∞ "

Resets AEDR

current value and

"START"

starts a new

measurement cycle

Turns on/off the beeps accompanying pulses detecting and buttons pressing

Note - If the shutter is opened before the background measurement is terminated, the measurement of average

count rate for beta and gamma radiation (γ + β) is started.

1.3.2 The detector converts gamma and beta radiation into a sequence of voltage pulses, the

quantity of which is proportional to the intensity of radiation detected.

Detector of ionizing gamma and beta radiation is the GM counter of Beta 2 type.

Circuit of anode voltage generation, digital processing, control and indication performs the

following functions:

scaling and linearization of detector counting response;

measurement of AEDR of gamma radiation and surface flux density of beta radiation by

means of measurement of the average rate of pulses coming from the detector output;

measurement AED of gamma radiation by means of measurement of total amount of pulses

at the detector output;

measurement AED accumulation time and real-time;

generation and stabilization of the detector anode voltage;

control of operation modes of the dosimeter;

display of measurement results at the indicator.

Data processing and control circuit is made on the basis of the microprocessor and used for

control of operation modes of the dosimeter, mathematical processing of pulse sequences from the

detector, for control of indicator and audible signals.

Anode voltage generator is used for generation of the anode voltage of + 400 V, required for

the detector operation.

For power supply of the processing and control circuit two AA-size batteries with total nominal

voltage of 3.0 V are used.

1.3.3 To reduce the dosimeter response time to the AEDR changes, autorestart mode is used.

When an arithmetic mean value of samples from last measurements deviates from the general

arithmetic mean by an amount that exceeds the error of the general arithmetic mean by predetermined

value, the start of new measurement is initiated.

background/AEDR/AED

"DOSE"

window

and backwards

Resets accumulated

AED, starts a new

measurement cycle

FVKM.412152.005RE

Shutter position

Shutter is opened – measurement of beta

radiation flux density

it off

Short pressing means nothing.

When the button is press and held for more

than 5 seconds, the dosimeter switches from

autorestart mode " -›!-› " to infinite

acquisition mode " ∞ " and backwards

Resets current value of the beta particles

flux density and starts a new measurement

-2

-1

"β [сm

min

window

cycle