Model of the Russian made Geiger-Müller tube SBT-11( СБТ-11 )

I have created this 1:1 scale model as an aid for designing things containing this excellent Russian-made Geiger-Müller tube. English translation of specifications of this tube are here:

http://arduino-geiger-pcb.blogspot.com/2016/03/translated-specs-sbt10-sbt10a-sbt11-and.html

This looks to be one of the tubes which has the thinnest mica window and can be used for detecting alpha particles. See the bottom of this article (choose google translation to English in the dropdown box below the