Doza MKS-15D Snegir Gebruikershandleiding - Pagina 9
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If the user opens the shutter before the measurement is finished, the messages
"BACKGROUND IS NOT DEFINED", "measurement of β will be possible not earlier than in (time
before the measurement is finished) seconds" and the count rate measurement (γ + β) will start.
When the background measurement is finished, ass the display windows are available.
When the shutter is opened by means of a lever the display window "β [cm
automatically and measurement of the beta radiation flux density starts. To start a new measurement,
press the "START" button or close and open the shutter.
2.3.3.2 If during the dosimeter turn-on the shutter is opened, the message "CLOSE THE
SHIELD" appears on the display. After that the dosimeter will switch over to the sleep mode. When
the shutter is closed, the dosimeter starts background measurement.
When the shutter is being closed and it is in a middle position, the message "MOVE THE
SHUTTER TO THE EXTREME POSITION" is displayed. This message is warning and doesn't affect
the dosimeter operation modes.
ATTENTION! WITH THE SHUTTER IN A MIDDLE POSITION THE MEASUREMENTS
ARE NOT PERFORMED.
2.3.4 Measurement of AEDR of photon radiation
Measurement of AEDR of photon radiation starts when the dosimeter turns on at the shutter
closed and is carried out only in the gamma radiation measurement mode. The dimension is Sv×h
its submultiple units.
2.3.5 Measurement of AED of photon radiation
Measurement of AED of photon radiation starts when the dosimeter turns on at the shutter
closed and is carried out only in the gamma radiation measurement mode. The dimension is Sv or its
submultiple units.
To view the values of measured AED, select corresponding display window "DOSE" by
pressing the "MODE" button.
2.3.6 Measurement of the beta radiation flux density
Prior to measurement of the beta radiation flux density perform measurement of the
background gamma radiation according to 2.3.4.
The most accurate results will be obtained if during the background gamma radiation
measurement the dosimeter is located parallel to the surface to be measured and at a minimum distance
from it.
After the background measurement is completed, don't move the dosimeter and open the
shutter by moving the lever to the extreme lower position "γ". The measurement of the beta radiation
flux density will start automatically.
The measured value on the display of the beta radiation flux density and statistical uncertainty
of the measured value will be indicated in the display window "[cm
-2
measured value is cm
is on according to 2.3.6.
where
n
is the total count rate of beta and gamma radiation at the shutter opened;
n is the count rate of gamma radiation with the shutter closed;
0
is the sensitivity of the open detector to beta radiation.
The dosimeter was calibrated by the manufacturer using the
beta spectrum energy of 2284 keV).
-1
×min
. Each detected particle is accompanied by an audible signal, if the sound
FVKM.412152.005RE
n
n
0
F
,
9
2
×min]" is activated
-2
-1
]". The dimension of the
×min
90
90
Sr(
Y) source with the cutoff
-1
or
(2.1)