Thickness gauge demonstrating the principle of how materials of increasing thicknesses absorb increasing amounts of radioactive emissions, with Mullard MX168 Geiger-Muller Tube, Griffin & George 903 ratemeter and formerly containing a 1 microcurie sealed source. In perspex case 510mm wide x 405mm high x 270mm deep
Thickness gauge demonstrating the principle of how materials of increasing thicknesses absorb increasing amounts of radioactive emissions, with Mullard MX168 Geiger-Muller Tube, Griffin & George 903 ratemeter and formerly containing a 1 microcurie sealed source. In perspex case 510mm wide x 405mm high x 270mm deep
Thickness gauge demonstration (ex-Circulation Department).
