Calibration results obtained with Liulin-4 type dosimeters

Abstract

The Mobile Radiation Exposure Control System's (Liulin-4 type) main purpose is to monitor simultaneously the doses and fluxes at 4 independent places. It can also be used for personnel dosimetry. The system consists of 4 battery-operated 256-channel dosimeters-spectrometers. We describe results obtained during the calibrations of the spectrometers at the Cyclotron facilities of the University of Louvain, Belgium and of the National Institute of Radiological Sciences-STA, Chiba, Japan with protons of energies up to 70 MeV. The angular sensitivities of the devices are studied and compared with MonteCarlo predictions. We also present the results obtained at the HIMAC accelerator with 500 MeV/u Fe ions and at the CERN high energy radiation reference fields. Records made during airplane flights are shown and compared with the predictions of the CARI-6 model.

Time Profile of Cosmic Radiation Exposure During the EXPOSE-E Mission: The R3DE Instrument

“…The Radiation Risk Radiometer-Dosimeter for the EX-POSE-E facility (R3DE), which was mounted on the European Technology Exposure Facility (EuTEF) outside the European Columbus module of the ISS, is a Liulin-type miniature spectrometer-dosimeter (Horneck et al, 1999;Dachev et al, 2002;Hä der and Dachev, 2003). Figure 1 presents the external view of the EXPOSE-E facility (Rabbow et al, 2009(Rabbow et al, , 2012 and the R3DE instrument (Dachev, 2009), which is situated in the bottom left corner of the picture.…”

Time serial analysis of the induced LEO environment within the ISS 6A

“…The basic silicon detector is a 16×16 mm 2 square that is 0.3 mm thick (Dachev et al 2002). It is mounted with basic electronics and lithium ion battery for power as modeled in Fig.…”

“…In the present report, we emphasize the spatial dependence of the environment related to passage through the South Atlantic Anomaly (SAA) while a related paper (Nealy et al 2007) considers the time averaged environment relative to the measurements of Dachev et al (2002).…”

“…Various arrangements of detectors have been used to study the composition of the internal radiation fields within the spacecraft, which need to be understood in terms of computational models to allow a better understanding of the local environment at the location of the astronauts' critical tissues. As a result, a number of studies of the low Earth orbit (LEO) environment have been made to better understand the nature of the radiations within a spacecraft (Badhwar et al 1995a, Dudkin et al 1992, Keith et al 1992, Lyagushin et al 1998, Dachev et al 2002 and to understand these results in terms of computational models (Badhwar 1995b, Shinn et al 1995, Wilson et al 2002, Hugger et al 2003, Getselev et al 2004, Nealy et al 2007). With improved understanding of the LEO environment comes the possibility of testing new designs for future exploration systems in LEO orbital flight prior to commitment to human operations on the moon and Mars.…”

Forbush decreases registered onboard aircraft

“…We have been engaged in experimental studies of air crew exposure since 1991, also in the frame of different European activities (Spurný, 1997). Since the spring of 2000, we have been using for such measurements an energy deposition spectrometer based on a Si semiconductor, MDU (Dachev et al, 2002), the equipment is described in more detail in our recent papers (Dachev et al, 2002;. It allows the estimation of low (electrons, high-energy protons, mesons, etc.)…”