Search - Issue 31 - RADON IN SUB-REACTOR ROOM 210/7 OF “UKRYTTYA” OBJECT

RADON IN SUB-REACTOR ROOM 210/7 OF “UKRYTTYA” OBJECT
DOI: https://doi.org/10.31717/1813-3584.18.31.6
Cover not present RADON IN SUB-REACTOR ROOM 210/7 OF “UKRYTTYA” OBJECT
Category: Issue 31
Publication: 31
Summary

Characterization of radon, thoron and their daughter products in steam-distributing corridor rooms of Chornobyl NPP “Ukryttya” object, is described. In rooms 210/7 and 208/12 of the “Ukryttya” object, 14 sessions with using seismic radon station SRS-05 were made, which lasted from 70 to 155 hours, and sampled near 60 aerosol samples with radiometer “Alfarad+A”. It was stated that under average radon concentration 80 Bq/m3, maximum values reached 450 Bq/m3. The aerosol-carriers of 212Pb had volumetric activity up to 30 – 35 Bq/m3. Availability of radon, thoron and their daughter products impedes radiation monitoring and express measurements of aerosols-products of Chernobyl accident. The use of multi-layer Petryanov's filters allowed simultaneously researching the aerosol activities and their insize distribution. Based on amount of radionuclides retained in the layers, activity median aerodynamic diameter and standard geometry error was calculated. Average active median aerodynamic diameter of daughter products of radon and thoron was 0.1 μm. Middle value of equilibrium coefficient of radon and its daughter products was 0.8. It evidence, that air change in sub-reactor rooms of the “Ukryttya” object is week. In the surveyed rooms, additional personnel exposure due to radon and its daughter products inhalation can make around 10 % of limiting effective admissible dose. After the Arch is installed over the “Ukryttya” object, radiation situation for radon could deteriorate due to reduced natural airing.

Keywords:”Ukryttya” object, radon, daughter products of radon, activity median aerodynamic diameter, radiation doze.

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