Hybrid Ultra-Low-Radioactive Material for Protecting Dark Matter Detector from Background Neutrons

Zykova, M.; Grishechkin, M.; Khomyakov, A.; Mozhevitina, E.; Avetisov, R.; Surikova, N.; Gromov, M.; Chepurnov, A.; Nikulin, I.; Avetissov, I.

Авторы: Zykova Marina, Grishechkin Mikhail, Khomyakov Andrew, Mozhevitina Elena, Avetisov Roman, Surikova Nadezda, Gromov Maxim, Chepurnov Alexander, Nikulin Ivan, Avetissov Igor
Журнал: Materials
Том: 14
Номер: 13
Год издания: 2021
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Первая страница: 3757
Последняя страница: 3757
Номер статьи: 3757
DOI: 10.3390/ma14133757
Аннотация: A laboratory technology for a new ultra-low background hybrid material (HM) which meets the requirements for neutron absorption with simultaneous neutron detection has been developed. The technology and hybrid material can be useful for future low background underground detectors designed to directly search for dark matter with liquid noble gases. The HM is based on a polymethylmethacrylate (PMMA) polymer matrix in which gadolinium nuclei are homogeneously distributed up to 1.5 wt% concentration in polymer slabs of 5 cm thickness. To determine the 65 impurity elements by the inductively coupled plasma mass-spectrometry (ICP-MS) technique in the Gd-based preparations in 100–0.01 ppb range, the corresponding method has been developed. Limits of determination (LD) of 0.011 ppb for uranium, and 0.016 ppb for thorium were achieved. An analysis of Gd raw materials showed that the lowest contents of U and Th (1.2–0.2 ppb) were detected in commercial Gd-based preparations. They were manufactured either from secondary raw materials (extraction phosphoric acid) or from mineral raw materials formed in sedimentary rocks (phosphogypsum). To produce the Gd-doped HM the commercial GdCl3 was purified and used for synthesis of low-background coordination compound, namely, acetylacetonate gadolinium (Gd(acac)3) with U/Th contents less than LD. When dissolving Gd(acac)3 in methylmethacrylate, the true solution was obtained and its further thermal polymerization allowed fabrication of the Gd-doped PMMA with ultra-low background.
Добавил в систему: Аветисов Игорь Христофорович

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Hybrid Ultra-Low-Radioactive Material for Protecting Dark Matter Detector from Background Neutronsстатья Исследовательская статья

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