Operating manual ВІСТ.418266.006-03 НЕ
18
3.2.4.3.19 Perform operations 3.2.4.3.16 of the OM for gamma radiation DER from
137
Cs
source with the value of
)
10
(
0
*
H
= (80
10) mSv/h.
3.2.4.3.20 Perform operations 3.2.4.3.16 of the OM for gamma radiation DER from
137
Cs
source with the value of
)
10
(
0
*
H
= (800
100) mSv/h.
3.2.4.3.21 Perform operations 3.2.4.3.16 of the OM for gamma radiation DER from
137
Cs
source with the value of
)
10
(
0
*
H
= (8
0.1) Sv/h.
3.2.4.3.22 If the detecting unit’s kit includes the interface converter, gamma radiation DER
range and the limit of the basic relative permissible error during measurement are measured
according to the following procedure.
3.2.4.3.22.1 Prepare the detecting unit to measure gamma radiation DER. To do this:
- connect the detecting unit to the interface converter using ВІСТ.685621.002 service cable;
- connect the interface converter using ВІСТ.685622.003 the service cable to the switching
desk SPI-09 ВІСТ.468363.001 (hereinafter - the switching desk);
- connect the output of the switching desk using ВІСТ.685691.001 service cable to the input
A of the frequency meter according to ДСТУ 7227 (hereinafter referred to as the frequency meter),
which is switched in the frequency measurement mode with 10 s integration time;
- wires from DC power source with of (12.0±0.5) V voltage and with (6.0±0.1) V voltage
connect to the terminals "+12 V" and "+ 6 V" of the switching desk respectively.
3.2.4.3.22.2 Fix the detecting unit in the УПГД-3В carriage holder, so that the mechanical
center of gamma quanta beam coincides with the center of gamma detector.
3.2.4.3.22.3 Turn on the DC power source with (12.0±0.5) V voltage, set the CHANNEL
switch of the switching desk to position "1" and in 3 minutes after turning on the power, perform
five frequency measurements using the frequency meter.
3.2.4.3.22.4 Register the received readings in the protocol. Calculate the average value of
gamma radiation DER by the formula:
5
)
10
(
)
10
(
5
1
*
*
=
=
i
i
H
H
,
(4.10)
where
*
і
H
(10) – is the value of ambient dose equivalent rate, calculated by the formula:
*
і
H
(10) = Fi / K1,
(4.10.1)
where Fi - і
th
frequency value measured in hertz with the help of the frequency meter;
K1 – is the conversion factor for the 1st channel equal to 20.0773 "С
-1
• μSv
-1
• year".
3.2.4.3.22.5 Place the УПГД-3В carriage with the detecting unit in a position, where gamma
radiation DER from
137
Cs source equals to
)
10
(
0
*
H
= (8.0
1.0)
µSv/h.
In 3 minutes after the beginning of measurement, perform five measurements of gamma
radiation DER and enter the results into the protocol. Calculate the average gamma radiation DER
value.
3.2.4.3.22.6 Place the УПГД-3В carriage with the detecting unit in a position, where gamma
radiation DER from
137
Cs source equals to
)
10
(
0
*
H
= (8.0
1.0)
µSv/h and perform operations
(3.2.4.3.22.3, 3.2.4.3.22.4, 3.2.4.3.22.5, 3.2.4.3.8 – 3.2.4.3.14).
Содержание BDBG-09
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