A reliable and consistently reproducible technique to fabricate222Rn-loaded radioactive sources (â¼0.5â1 kBq just after fabrication) based on liquid scintillator (LS), with negligible amounts of LS quencher contaminants, was implemented. This work demonstrates the process that will be used during the Borexino detectors upcoming calibration campaign, where one or several â¼100 Bq such sources will be deployed at different positions in its fiducial volume, currently showing unprecedented levels of radiopurity. These sources need to fulfill stringent requirements of222Rn activity, transparency to the radiations of interest and complete removability from the detector to ensure their impact on Borexino's radiopurity is negligible. Moreover, the need for a clean, undistorted spectral signal for the calibrations imposes a tight requirement to minimize scintillator quenching agents (âquenchersâ) to null or extremely low levels.
Fabrication of quencher-free liquid scintillator-based, high-activity222Rn calibration sources for the Borexino detector / D. Bravo-Berguño, L. Miramonti, P. Cavalcante, V. Roca, S. Hardy, R.B. Vogelaar. - In: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH. SECTION A, ACCELERATORS, SPECTROMETERS, DETECTORS AND ASSOCIATED EQUIPMENT. - ISSN 0168-9002. - 879(2018 Jan), pp. 112-120. [10.1016/j.nima.2017.10.015]
Fabrication of quencher-free liquid scintillator-based, high-activity222Rn calibration sources for the Borexino detector
L. Miramonti;
2018
Abstract
A reliable and consistently reproducible technique to fabricate222Rn-loaded radioactive sources (â¼0.5â1 kBq just after fabrication) based on liquid scintillator (LS), with negligible amounts of LS quencher contaminants, was implemented. This work demonstrates the process that will be used during the Borexino detectors upcoming calibration campaign, where one or several â¼100 Bq such sources will be deployed at different positions in its fiducial volume, currently showing unprecedented levels of radiopurity. These sources need to fulfill stringent requirements of222Rn activity, transparency to the radiations of interest and complete removability from the detector to ensure their impact on Borexino's radiopurity is negligible. Moreover, the need for a clean, undistorted spectral signal for the calibrations imposes a tight requirement to minimize scintillator quenching agents (âquenchersâ) to null or extremely low levels.File | Dimensione | Formato | |
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