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Article Dans Une Revue JINST Année : 2023

Study on U/Th residual radioactivity in acrylic from surface treatment

Yuanxia Li
  • Fonction : Auteur
Xiaohui Qian
  • Fonction : Auteur
Xiaolan Luo
  • Fonction : Auteur
Jie Zhao
  • Fonction : Auteur
Gaofeng Zhang
  • Fonction : Auteur
Xiaoyan Ma
  • Fonction : Auteur
Yuekun Heng
  • Fonction : Auteur
Liangjian Wen
  • Fonction : Auteur
Monica Sisti
  • Fonction : Auteur
Hongqiang Tang
  • Fonction : Auteur

Résumé

Acrylic is widely used as material for the target container in low background experiments due to its high light transparency and low intrinsic radioactivity. However, its surface can be easily contaminated during production, so careful treatment of the surface is essential to avoid direct contamination of the target. The Jiangmen Underground Neutrino Observatory will use about 600~t of acrylic to build the spherical vessel of 35.4~m in diameter for a 20~kt liquid scintillator (LS). Since acrylic will contact the LS directly, the cleanliness of the its surface is quite important for the radiopurity of the LS. A new method for measuring the radioactivity of $^{238}$U and $^{232}$Th in acrylic to sub-ppt ($<10^{-12}$~g/g) was developed, and it is crucial for the acrylic radioactivity screening in this study. We performed many background tests on different surface treatments, and the recommended procedure for the treatment of acrylic to achieve low radioactivity and high light transparency could be applicable to other low background experiments.

Dates et versions

hal-03960037 , version 1 (27-01-2023)

Identifiants

Citer

Yuanxia Li, Xiaohui Qian, Xiaolan Luo, Jie Zhao, Gaofeng Zhang, et al.. Study on U/Th residual radioactivity in acrylic from surface treatment. JINST, 2023, 18 (05), pp.P05023. ⟨10.1088/1748-0221/18/05/P05023⟩. ⟨hal-03960037⟩

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