Characterization and long-term performance of the Radon Trapping Facility operating at the Modane Underground Laboratory

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00517495" target="_blank" >RIV/61389005:_____/19:00517495 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985891:_____/19:00511399 RIV/68407700:21670/19:00334472 RIV/86652052:_____/19:N0000055

Výsledek na webu

<a href="https://doi.org/10.1088/1361-6471/ab368e" target="_blank" >https://doi.org/10.1088/1361-6471/ab368e</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6471/ab368e" target="_blank" >10.1088/1361-6471/ab368e</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Characterization and long-term performance of the Radon Trapping Facility operating at the Modane Underground Laboratory

Popis výsledku v původním jazyce

Radon is one of the main potential sources of background radiation for any rare event experiments like neutrinoless double beta decay or dark matter experiments. The Radon Trapping Facility (RTF) installed in 2004 at the Modane Underground Laboratory (LSM) has been running for nine years providing radon-purified air at a level of 10 mBq m(-3) for several experiments. The radon suppression principle is based on a radon physical adsorption using cooled compressed air at -55 degrees C pumped through a column filled with the K48 activated charcoal. After disassembling of the RTF, the 2.6 m high charcoal column has been divided into several layers in order to study with different techniques the dynamic adsorption coefficient (the K-factor) as a function of the depth and the radon spatial trapping profile by measuring the Pb-210 activity. It has been demonstrated that after almost a decade of running, the K-factor of the activated charcoal remains constant except for the first few cm of the column. Furthermore, it has been demonstrated that the mass activity of Pb-210 as a function of the depth of the charcoal column exhibits an exponential decay profile. The radon mean retention time tau(R) of (47.6 +/- 1.2) days and the radon mean free path of (28.9 +/- 0.4) cm have been derived and found to be consistent at 1 sigma with the ones obtained from the K-factor study, i.e. from a total independent measurement. The radon suppression factor of the RTF of 6790(-1720)(+/- 2370) has been also estimated with a value consistent at 2 sigma with the suppression factor measured during the RTF operation. Thus, this study has proven the capacity of the RTF to purify the LSM air from radon by more than three orders of magnitude during nine years of operation.

Název v anglickém jazyce

Characterization and long-term performance of the Radon Trapping Facility operating at the Modane Underground Laboratory

Popis výsledku anglicky

Radon is one of the main potential sources of background radiation for any rare event experiments like neutrinoless double beta decay or dark matter experiments. The Radon Trapping Facility (RTF) installed in 2004 at the Modane Underground Laboratory (LSM) has been running for nine years providing radon-purified air at a level of 10 mBq m(-3) for several experiments. The radon suppression principle is based on a radon physical adsorption using cooled compressed air at -55 degrees C pumped through a column filled with the K48 activated charcoal. After disassembling of the RTF, the 2.6 m high charcoal column has been divided into several layers in order to study with different techniques the dynamic adsorption coefficient (the K-factor) as a function of the depth and the radon spatial trapping profile by measuring the Pb-210 activity. It has been demonstrated that after almost a decade of running, the K-factor of the activated charcoal remains constant except for the first few cm of the column. Furthermore, it has been demonstrated that the mass activity of Pb-210 as a function of the depth of the charcoal column exhibits an exponential decay profile. The radon mean retention time tau(R) of (47.6 +/- 1.2) days and the radon mean free path of (28.9 +/- 0.4) cm have been derived and found to be consistent at 1 sigma with the ones obtained from the K-factor study, i.e. from a total independent measurement. The radon suppression factor of the RTF of 6790(-1720)(+/- 2370) has been also estimated with a value consistent at 2 sigma with the suppression factor measured during the RTF operation. Thus, this study has proven the capacity of the RTF to purify the LSM air from radon by more than three orders of magnitude during nine years of operation.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10304 - Nuclear physics

Projekt

<a href="/cs/project/LM2015072" target="_blank" >LM2015072: Podzemní laboratoř LSM – účast České republiky</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název periodika

Journal of Physics G-Nuclear and Particle Physics

ISSN

0954-3899

e-ISSN

—

Svazek periodika

46

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

17

Strana od-do

115105

Kód UT WoS článku

000488088100002

EID výsledku v databázi Scopus

—