markemer’s avatarmarkemer’s Twitter Archive—№ 53,667

  1. …in reply to @mikamckinnon
    mikamckinnon @AmandaRTubbs Ir-192? In the good old days we used Cs-137 or Co-60. They make for nice blues. I would suggest keeping a box with any of those things closed, though.
    On twitter.com Twitter logo markemer’s avatar Mood +6 🙂