Doza DKG-05D Betriebshandbuch - Seite 11

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4 VERIFICATION

4.1 General

4.1 Dosimeter verification is performed by the State metrology service or other

authorized organizations certified for the right of metrological testing. Requirements to

verification organization, procedure and result recording are established by Measuring

Instrument Verification. Organization and procedures ПР 50.2.006-94.

All new manufactured and repaired dosimeters as well as dosimeters in operation are

subjected to verification.

Initial calibration should be performed after production and repair of dosimeters.

Periodical verification is carried out for dosimeters in operation once in a year.

4.2 Operations and verification equipment

Operations and equipment shown in Table 4.1 should be used while verification tests.

Table 4.1 – Operations and equipment for verification

Operation

1. Visual examination

2. Test

 

3. Assessment of

 

 

and

measurement relative

error

4. Results recording

Note – It is permitted to use verification means and equipment newly elaborated or in operation, which are

similar or better than these shown in the present verification technique.

4.3 Safety requirements

When conducting verification, safety requirements of 3.2 and given in documentation on

applied verification means and equipment are obligatory.

4.4 Conditions

Verification should be carried out under the following conditions:

Ambient air temperature ....................................................... +20 ±5°С;

Relative air humidity ............................................................ from 30 to 80 %;

Atmospheric pressure ........................................................... from 86 to 106,7 kPa;

Natural radiation background................................................ no more than 0,2 Sv/h.

4.5 Procedure

4.5.1 Visual examination

Visual examination one should check:

Verification equipment and their

No. of item

reference technical

specifications

4.5.1

Visually

4.5.2

4.5.3

Verification installation УПГД-

1М or similar with

sources, which provides

exposure to

0,1 to mSv/h with the error of no

more than 5 %.

Chronometer С1-2a

TУ 25-1 819.0027-90.

Phantom: - cube 30×30×30 cm,

tissue equivalent substance

4.6

calibration

137

 

 

within:

ФВКМ.412113.005РЭ

Obligatory for

Primary

Periodical

verification

Yes