Overview on radiation quantities observed by Liulin-5 instrument in a human phantom on the international space station during the minimum of the 23rd solar cycle

An essential parameter for assessment of radiation risk to humans in space is the organ dose determination. Human phantoms equipped with active and passive radiation detectors are used to obtain better knowledge of the dose distribution inside the human body. The radiation environment in the spherical tissue-equivalent phantom of MATROSHKA-R international project aboard the International Space Station (ISS) is observed by the Liulin-5 particle telescope. The objectives of Liulin-5 experiment are studying the dynamics of depth-dose distribution of the different components of the orbital radiation field in a human phantom and mapping the radiation environment in the phantom and its variations with time and orbital parameters (such as solar cycle, solar flare events, inclination and altitude). The particle telescope Liulin-5 measures the time-resolved linear energy transfer (LET) spectrum, flux and absorbed dose rates for electrons, protons and biologically relevant heavy ion components of the cosmic radiation, simultaneously at three depths of the phantom radial channel. The data are available for the period June 2007 - September 2009. In this paper we present new results for radiation quantities obtained from different components of the complex radiation field in the ISS during the minimum of the 23rd solar cycle and compare them with data from other active and passive radiation detectors in the ISS. (authors)