In this work we present simulation results for a modular tritium in-water real-time monitor. The system allows for scalability in order to achieve the required sensitivity. The modules are composed by 340 uncladed scintillating fibers immersed in water and 2 photosensors for light readout. Light yield and Birks' coefficient uncertainties for low energy beta particles is discussed. A study of the detection efficiency according to the fiber length is presented. Discussion on the system requirements and background mitigation for a device with sensitivity of 100\,Bq/L, required to comply with the European directive 2013/51/Euratom, is presented. Due to the low energetic beta emission from tritium a detection efficiency close to 3.3\% was calculated for a single 2\,mm round fiber.
@article{arxiv.2002.06050,
title = {Simulation results on a real-time in water tritium monitor},
author = {C. D. R. Azevedo and A. Baeza and E. Chauveau and J. A. Corbacho and J. Díaz and J. Domange and C. Marquet and M. Martínez-Roig and F. Piquemal and J. F. C. A. Veloso and N. Yahlali},
journal= {arXiv preprint arXiv:2002.06050},
year = {2022}
}