• An Evaluation of Shielding Characteristics Applicable to Mini-Gas-Proportional Counter-Based 14C Dating Systems

      Kaihola, Lauri; Kojola, Hannu; Polach, Henry; Soini, Erkki; Otlet, Robert (American Journal of Science, 1983-01-01)
      A mini-gas-proportional counter prototype of 10ml capacity (at NTP) was constructed of oxygen-free Finnish copper. The counter tube will be one of 16 equivalent tubes of a small-sample gas counting system, which is equipped with passive graded shield made of lead, cadmium, and copper and a dual active anticoincidence shield, consisting of an external cosmic gas-proportional and an internal plastic scintillation guard. The aim of this study was to evaluate the parameters leading to the design of a cost-effective and compact shielding package for mini-counters.