"I've been reading about Pannach's death lately. He died prematurely of an unusual kind of cancer, as did Jürgen Fuchs and Rudolf Bahro, both dissidents and writers. All of them had been in Stasi prisons at around the same time."
For more information and sources regarding the Stasi's use of radiation, see the endnotes on page 285. Sadly, in 2006, after the publication of this book, Klaus Renft passed away, also from cancer.