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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 clear 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

(10) (further –

DER) and personal dose equivalent Н

(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;

Polimaster PM1621A User Manual

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