5th international comparison of radon/thoron and radon short-lived decay products measurement instruments

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F86652052%3A_____%2F19%3AN0000037" target="_blank" >RIV/86652052:_____/19:N0000037 - isvavai.cz</a>

Result on the web

<a href="https://www.suro.cz/cz/vyzkum/vysledky/centrum-rozvoje-technologii-pro-jadernou-a-radiacni-bezpecnost-ranus-td" target="_blank" >https://www.suro.cz/cz/vyzkum/vysledky/centrum-rozvoje-technologii-pro-jadernou-a-radiacni-bezpecnost-ranus-td</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

5th international comparison of radon/thoron and radon short-lived decay products measurement instruments

Original language description

During the 9th International Conference on Protection against Radon at Home and at Work held in September 2019 in Prague, the 5th international comparison of radon/thoron and radon short-lived decay products measurement instruments was organized by and held at the Division of the Natural Sources of Irradiation of the National Radiation Protection Institute (NRPI, SÚRO v.v.i.) in Prague. The main goal of these international comparisons was primarily to assist participants in their accreditation process. In addition, the instruments were tested in radon atmosphere under special conditions, which can strongly affect their responses. For these tests the parameters as humidity, aerosol concentration, aerosol size distribution were varied so that the measurement conditions more corresponded to the real situation occurring in houses or workplaces. The NRPI radon calibration facility based on a big (45 m3) radon and a small (150 dm3) radon/thoron chambers and relevant measurement standards allow to compare the measurement ability of all the existing types of radon/thoron and radon decay product measurement instruments (spot, passive integral detectors and, continuous monitors) with the NRPI reference instruments traceable to national standards. The NRPI declares results with the combined standard uncertainty (k=1) of the activity concentration better than 5 % (in range 1-10 kBq/m3) for 222Rn in air , better than 10 % (in range 1-10 kBq/m3) for 220Rn in air and the same uncertainty also for radon and thoron mixtures. In addition, the NRPI declares uncertainty (k=1) better than 10 % (in range 1-10 kBq/m3) for equivalent equilibrium radon concentration (EEC) and better than 15 % for unattached fraction of EEC ( fp). In total, 13 laboratories from nine countries took part in this international comparison. They submitted 14 continuous monitors, six passive integral systems for radon measurements and one continuous monitor for measurement of radon short-lived decay products (EEC) in the walk- in radon chamber. Additionally, a unique continuous radon/thoron diffusion monitor and two radon/thoron discriminative integral systems based on solid state alpha track detectors (SSNTD) and electrets ion chamber (EIC), respectively were submitted for separate measurement of 222Rn/220Rn activity concentration in their mixtures carried out in the small NRPI radon/thoron chamber.

Czech name

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Czech description

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Type

W - Workshop organization

CEP classification

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OECD FORD branch

30304 - Public and environmental health

Project

<a href="/en/project/TE01020445" target="_blank" >TE01020445: Radiation and nuclear safety technologies development center: RANUS - TD</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Event location

Praha

Event country

CZ - CZECH REPUBLIC

Event starting date

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Event ending date

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Total number of attendees

13

Foreign attendee count

9

Type of event by attendee nationality

EUR - Evropská akce