DOSIS and DOSIS 3D – active and passive radiation measurements in Columbus from 2009 – 2025

Abstract

The radiation environment encountered in space differs in nature from that on Earth, consisting mostly of highly energetic ions from protons up to iron, resulting in radiation levels far exceeding the ones present on Earth for occupational radiation workers. Since the beginning of the space era the radiation exposure during space missions has been monitored with various passive and active radiation instruments. Also, on-board the International Space Station (ISS) a number of area monitoring devices provide data related to the spatial and temporal variation of the radiation field in – and outside the ISS. The aim of the DOSIS (2009 – 2011) and DOSIS 3D (2012 - ongoing) experiment is the measurement of the radiation environment within the European Columbus Laboratory of the ISS. These measurements are, on the one hand, performed with passive radiation detector packages (PDPs) mounted at eleven locations within Columbus for the determination of the spatial distribution of the radiation field parameters and, on the other hand, with two active radiation detectors (DOSimetry TELescope =DOSTEL) mounted at a fixed position inside Columbus for the determination of the temporal variation of the radiation field parameters. Up to September 2025 a total number of 28 long-term exposures of the PDPs have taken place inside Columbus with a total measurement duration of 5336 days. Data from the two DOSTEL instruments cover a total measurement time of over 8500 days from 2009 – 2025. The talk will give an overview of the current results of the data evaluation performed for the passive and active radiation detectors in the years 2009 – 2025.