ECOTEST DKG-21 - Page 63

61
Take five measurements of background DER (
)10(
рфі
H

) in УПГД-3Б
with 10 s interval in thirty minutes after the dosimeter is switched on.
Calculate the average DER value in μSv/h by the formula
5
)10(
)10(
10
1

=
=
i
рфі
pф
H
H


(5.1)
5.2.7.4.3 Place the УПГД-3Б carriage together with the phantom and
the dosimeter in the position, where DER from the source with
137
Cs
radionuclide is
)10(
0p
H

= (8±1) μSv/h. Take five measurements of DER
with 10 s interval in thirty minutes after irradiation of the dosimeter was
started. Calculate the average DER value (
)10(
p
H

by the formula (5.1).
Calculate the DER value without gamma background DER of the УПГД-
3Б by the formula
)10()10()10(
pфpp
HHH

−=

(5.2)