Polimaster PM1603A User Manual

34
when DER is equal to 80.0 mSv/h, six segments should be indicated when DER is equal
to 800 mSv/h and seven segments when DER value is more than 1000 mSv/h;
11) calculate the intrinsic relative error Q
j
of DER measurement in percents by
formula
( )
Qj
Н Н H
H
J Ф Oj
Oj
=
− −
×
• •
•
•
100%
(3)
where
Η
•
Oj
– is a calculated value of DER in the point of measurement, in mSv/h;
•
Η
j
– is the measured average value of DER in the point of measurement, in mSv/h;
•
Η
b – is the measured average value of DER background in the point of measurement,
in mSv/h.
12) calculate the confidential limits of the permissible intrinsic error δ of DER
measurement, in %, for the confidence coefficient 0.95, by formula
( ) ( )
22
QjQo1,1 +=δ
(4)
where:
Qo – is an error of a standard dosimetric assembly (in %);
Qj – is the intrinsic relative error of DER measurement calculated by formula (3), in
%.
13) compare the confidential limits of the permissible intrinsic error δ calculated by
formula (4), with an acceptable value of the permissible intrinsic error δ
acc
calculated by
formula
δ
acc
= ±(15 + K
1
/
Η
•
+ K
2
Η
•
) %, (5)
where
Η
•
– is DER value, mSv/h;
K
1
– coefficient equal to 0.02 mSv/h;
K
2
– coefficient equal to 0.003 (mSv/h)
-1
(for PM1603 and PM1603A dosimeters);
K
2
– coefficient equal to 0.002 (mSv/h)
-1
(for PM1603B dosimeter);
If δ > δ
acc
 the dosimeter is rejected, if δ ≤ δ
acc
 the dosimeter is considered to be good.
А.7.3.2. To determine the intrinsic relative error of the DE measurement the following
operations should be performed:
1) set the maximum values of the DER and DE thresholds and enter the DE
measurement mode;
2) place the dosimeter on a dosimetric verification assembly so that the graduation
direction should coincide with the direction of radiation flow and the longitudinal axis of
radiation flow should pass through the geometric center of the detector. Graduation
direction and geometric center of the detector are marked in the operating documentation;
3) read the initial DE value from the dosimeter;
4) create DER equal to 8.0 mSv/h from the
137
Cs gamma radiation source at a point
of the geometric center of the detector and irradiate the dosimeters during the time period
T equal to 30 min;
5) read the final DE value after the end of irradiation;
6) calculate the intrinsic relative error G
j
of DE measurement, in %, by formula

Polimaster PM1603A Specifications

General

Brand	Polimaster
Model	PM1603A
Category	Measuring Instruments
Language	English