FIRST RESULTS OF SUBSURFACE RADON MONITORING BY NETWORK OF POINTS, OPERATING IN THE TEST MODE ON THE SOUTH OF SAKHALIN ISELAND Journal title: Вестник КРАУНЦ. Физико-математические науки Authors: Evgeniy Makarov, Pavel Firstov, Dmitry Kostylev, Evgeny Rylov, Ilia Dudchenko Subject(s):