Hi all I am a 17 years old student and I want to make a ion chamber to measure the ultraviolet radiation in the stratosphere. My project will be connected to a balloon that will fly to a 30 km height. I am going to make our first prototype with my team it will be the most basic ion chamber: I got some information about how the chamber works so when the ultraviolet radiation passes through air collision with the air molecules produce ion pairs the positive pair will go to the wire in center of my tin and it will create a very small current but the current is to small as we could measure so we have to amplify the voltage so we can measure the voltage. I saw also that the tin should be closed with aluminium foil so that it don't lets too much stray electric field in, but I will measure it in big heights so I think I can leave it open please correct me if I am wrong and if you have some tips and expirience with building ion chambers I could need help. Thank you, Filip.