Comparative measurements of mixed radiation fields using liulin and AIRDOS dosimeters Available to Purchase

Cosmic rays represent not only a significant health risk to the crew of spacecraft and aircraft but also a fundamental phenomenon of basic research on the origin and composition of the universe. High-energy atmospheric physics is a newly opened research domain which focuses on research of terrestrial gamma-ray flashes that can measurably contribute to the aircraft-crew irradiation according to the preliminary computer simulations. High-mountain observatories are suitable places for both the con-tinual monitoring of cosmic radiation and the detection of ionizing radiation generated by lightning. Liulin Mobile Dosimetry Unit (MDU) is a silicon diode based radiation dosimeter developed by the team of Tsvetan Dachev at the Bulgarian Academy of Sciences, initially for the MIR space station. It is widely used as an instrument for radiation monitoring on board aircraft, on high altitude observatories as well as for example for ion fragmentation studies. The AIRDOS dosimeter is an open source device for measurement in low intensity mixed ionising radiation fields. In its aircraft version, it houses silicon PIN diode as a radiation detector, an electronics for conversion of the signal to the pulse-height spectra, Global Positioning System (GPS) module, memory card and batteries for one-month monitoring. The hardware design of AIRDOS is built on the Open Hardware modular platform MLAB, the firmware is written in Open Software platform Processing. Full documentation is freely available. Two AIRDOS de-vices have been installed at Basic Enviromental Observtory (BEO) Moussala in December 2017, complementing the radiation and environment monitoring instruments already available, including the Liulin MDU. Preliminary results of comparative measure-ments of radiation environment at BEO Moussala using the AIRDOS units and Liulin MDU will be presented. The results from BEO Moussala will be compared with data acquired on board aircraft.