Doza MKS-15D Snegir Podręcznik użytkownika - Strona 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
6
-2
-1
"β [сm
min
]"
×
window
cycle