uh ..how sad...david hahn passed away ..haven´t noticed this :yabbem:
ive got a vintage counter dp63a ..that has a radium paint dial , i measure 10mr/h behind the thick glas..havent dissassembled yet
also inside: B-8 Sr90 source (100mrad/h)
another source: DP-2 , Sr-90 as well, ~6 rad/h...