5 VERIFICATION METHOD
5.1 Introduction
Current verification procedure covers РМ1621, РМ1621А, РМ1621М and
РМ1621МА (further – dosimeters) and scheduled dosimeters verification.
Verification is done by local state metrological services (Gosstandart (state
standard of manufacturer country) and correspondingly authorized companies.
Verification is done by the manufacturer on the site, after repair, while in service
and storage with 12 months periodicity.
5.2 Verification procedures and tools
Verification requires the following procedures and tools, stated in the Table 5.1.
Table 5.1
Verification
procedure
chapter
number
Name of reference and auxiliary measurement tools; their
main characteristics
Calibration assembly with
137
Cs source. Certified
uncertainty of calibration assembly must be no more
than 5 % at confidence probability 0.95
Barometer. Scale interval 1 kPa. Measurement range 60 -
120 kPa
Thermometer. Scale interval 0.1 С. Measurement range
10 - 30 С
Hydrometer. Measuring range 30 - 90%
Stopwatch. Range of measurement from 1 to 600 s
Dosimeter DBG-06Т. Main error 15%. (Another
dosimeter allowing required measurement accuracy can
be used)
Water phantom, dimensions 30х30х15 cm*
* A plane-parallel phantom from PMMA, dimensions 30х30х15 cm, can be used
5.3 Verification officers’ qualification requirements
Only persons certified as state verification officers in accordance with established
procedure are allowed to conduct measurements during verification and (or) analyze
measurement results.
5.4 Safety requirements
5.4.1 Obligatory safety requirements for verification:
- any works with radioactive sources must be done according to state and local
safety instructions for radioactive sources and other ionizing radiation sources valid at the
verification site.
5.4.2 Verification process must be referred to working under harmful labor
conditions.
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