Bulgarian instrument RADOM-7 will be installed aboard Chandrayaan - the Indian lunar mission slated for launch somewhere next year. It will measure cosmic radiation.
Unfortunately little is known about RADOM-7. Even the site of Bulgarian Aerospace Instutute has nothing about it. I think I'll have to pay a visit to Bulgarian Academy of Science this autumn and I'll try to find someone involved in the project so he could give me more information. I'll update this thread when I get the info as soon as possible.