Polimaster PM1621, Руководство по эксплуатации

Страница: 28 / 35

28
5.5 Verification conditions
Verification requires following conditions:
ambient air temperature
20 5
С;
- relative air humidity 60 (+20;- 30) %;
- atmospheric pressure 101.3 (+5.4; -15.3) kPa;
- ambient gamma radiation
no more than 0.2 µSv/h.
5.6 Pre-verification procedure
Pre-verification requires following preparatory procedures:
- carefully read current Operation Manual;
- make instrument ready for operation according Chapter 2.3 of the current
Operation Manual.
5.7 Verification procedure
5.7.1 External examination of the instrument
When doing external examination, be sure that the instrument corresponds to the
following requirements:
- instrument delivery kit corresponds to Operation Manual requirements;
- there is initial verification mark in the Operational Manual or certificate of the last
verification;
- there are cl
ear markings on the instrument’s surface;
- there is no dirt and mechanical damages that can influence instrument operation.
Instrument is considered as not valid for further verification if it doesn’t meet the
above requirements.
5.7.2 Carrying out verification (testing)
Testing requires following:
- check instrument operability according to Chapter 2.4 of current Operation
Manual;
- set maximum threshold levels of personal dose equivalent rate
H
р
(10) (further
–
DER) and personal dose equivalent
Н
р
(10) (further
–
Chapter 2.4.5 of current Operation Manual.
5.7.3 Metrological examination
5.7.3.1 DER measurement main relative error is calculated as follows:
1) switch on DER measurement mode;
2) fasten the dosimeter on the phantom so that
“This side to body” inscription faces
the phantom. Place the dosimeter with phantom onto the verification dosimetric unit so that
the normal line from the geometrical center of phantom
’s front wall coincides with the
central axis of collimator of verification dosimetric unit. Central axis of collimator of
verification dosimetric unit must go through geometrical center of detector of the dosimeter
being tested, figure 5.1. Geometrical center of detector is stated in the
dosimeter’s
Operation Manual;