*WO 2007030740. Lewis G. Larsen, Chicago, IL (US); Allan Widom, Brighton, MA (US). 22.2.2011. Apparatus and method for absorption of incident gamma radiation and its conversion to outgoing radiation at less penetrating, lower energies and frequencies. | *WO 2007030740. Lewis G. Larsen, Chicago, IL (US); Allan Widom, Brighton, MA (US). 22.2.2011. Apparatus and method for absorption of incident gamma radiation and its conversion to outgoing radiation at less penetrating, lower energies and frequencies. |