Environmental $γ$-Ray Flux in Hall C at LNGS and Its Correlation with Radon Activity
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arXiv
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| Format: | Preprint |
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2026
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| author | Luzzi, L. Santorelli, R. Zuzel, G. Agnes, P. Cano-Ott, D. Ghiano, C. Laubenstein, M. Mroz, T. Fortes, V. Pesudo del Olmo, J. Plaza Díaz, G. Vera |
| author_facet | Luzzi, L. Santorelli, R. Zuzel, G. Agnes, P. Cano-Ott, D. Ghiano, C. Laubenstein, M. Mroz, T. Fortes, V. Pesudo del Olmo, J. Plaza Díaz, G. Vera |
| contents | We report a comprehensive measurement of the environmental $γ$-ray flux in Hall C of the Gran Sasso National Laboratory. A spatial mapping of the radiation was carried out using a high-purity germanium detector mounted on a movable cart and deployed at eight locations within the hall. The detector response function and full-energy-peak efficiencies were determined through Geant4 simulations validated with calibrated $γ$-ray sources, with particular attention devoted to the efficiency modeling and associated systematic uncertainties. In the energy range of 57-2800 keV, the average $γ$-ray flux is measured to be $(\mathrm{0.46} \pm \mathrm{0.06}_{stat} \pm \mathrm{0.03}_{syst})$ $\mathrm{cm}^{-2}$ $\mathrm{s}^{-1}$. The radon level was monitored for about a month using a radon detector mounted on the same cart, and a clear correlation is observed between the environmental $γ$-ray rate and the ambient radon concentration, consistent with the short-lived daughters of $^{222}\mathrm{Rn}$. This result represents the first high-precision and efficiency-corrected mapping of the $γ$-ray flux in Hall C, substantially improving its radiological characterization and providing key input for future rare-event experiments operating in this hall. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_09835 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Environmental $γ$-Ray Flux in Hall C at LNGS and Its Correlation with Radon Activity Luzzi, L. Santorelli, R. Zuzel, G. Agnes, P. Cano-Ott, D. Ghiano, C. Laubenstein, M. Mroz, T. Fortes, V. Pesudo del Olmo, J. Plaza Díaz, G. Vera Instrumentation and Detectors We report a comprehensive measurement of the environmental $γ$-ray flux in Hall C of the Gran Sasso National Laboratory. A spatial mapping of the radiation was carried out using a high-purity germanium detector mounted on a movable cart and deployed at eight locations within the hall. The detector response function and full-energy-peak efficiencies were determined through Geant4 simulations validated with calibrated $γ$-ray sources, with particular attention devoted to the efficiency modeling and associated systematic uncertainties. In the energy range of 57-2800 keV, the average $γ$-ray flux is measured to be $(\mathrm{0.46} \pm \mathrm{0.06}_{stat} \pm \mathrm{0.03}_{syst})$ $\mathrm{cm}^{-2}$ $\mathrm{s}^{-1}$. The radon level was monitored for about a month using a radon detector mounted on the same cart, and a clear correlation is observed between the environmental $γ$-ray rate and the ambient radon concentration, consistent with the short-lived daughters of $^{222}\mathrm{Rn}$. This result represents the first high-precision and efficiency-corrected mapping of the $γ$-ray flux in Hall C, substantially improving its radiological characterization and providing key input for future rare-event experiments operating in this hall. |
| title | Environmental $γ$-Ray Flux in Hall C at LNGS and Its Correlation with Radon Activity |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2605.09835 |