I am preparing to run an autorad experiment using D1 and D2 tritiated ligands; however, it recently came to my attention that GE no longer makes the tritium microscales and the only other manufacturer (ARC) produces a sub-par product. We have been in touch with Perkin-Elmer, but they don't produce any H3 microscales, nor do they have a recommendation. I've been told you can make your own using brain paste and calibrating to the low end of a C14 scale; however, this is time consuming and will push back my experiment much longer than I would like. I would appreciate any recommendations you have to offer!