Abstract
New monitoring system for purpose free release of materials into the living environment with a 600 L container counting geometry was designed and developed. Considering that monitoring system is classified as a dedicated measuring instrument the metrological certification is necessary. For purpose of metrological qualification tests the checking verification container (phantom) was proposed and manufactured. The arrangement of the reference sources in the volume of checking container was designed so that it approximates evenly activity distribution considered at efficiency calibration. Description of monitoring system, measurement uncertainty assessment, design of checking container and results of metrological qualification tests are in more detail discussed. Highlights • The procedure for metrological certification of the gamma spectrometry monitoring system based on the twin HPGe detectors with 600 L rectangular container counting geometry was proposed. • The checking container (phantom) containing 24 holes for rod calibration sources evenly mounted through the container in direction of detectors axes was designed and manufactured. • Proposed arranged of holes for rod sources approximate the homogenous distribution of the activity in container volume that is expected during usual measurement.
Highlights
Important part of decommissioning project of nuclear power plant A1 in Slovakia is free release of materials into the environment
For purpose of the monitoring capacity increasing during free release of materials, mainly soil and concrete rubble, the monitoring system of 600 L containers was recently developed and delivered
Metrological certification tests were performed by Slovak Institute of Metrology by help 6 rod sources of 137Cs and 152Eu
Summary
Important part of decommissioning project of nuclear power plant A1 in Slovakia is free release of materials into the environment. For purpose of the monitoring capacity increasing during free release of materials, mainly soil and concrete rubble, the monitoring system of 600 L containers was recently developed and delivered. Using counting geometry of 600 L rectangular container that is equipped with self-discharger is able to increase the total monitoring capacity. The monitoring system is able to monitor a material in standard counting geometry of 200 L drum. According to the Slovak legislation (Metrological Act Nr. 142/200 Coll.) a metrological certification is required because the monitoring system is considered as dedicated measuring instrument.
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