Strontium-90 is of relevant biological importance among fission products released during a fission reactor accident. Rapid information on its concentration in environmental matrices is extremely valuable, yet this implies chemical separations and handling with a shift in daughter equilibrium and therefore the need to wait a sufficient time for the equilibrium to be reestablished. The work concerns a feasibility study of a multi-detector system for a prompt evaluation of the90Sr activity or, at least, a prompt determination of its order of magnitude in the presence of other pure β and β-γ emitters; their interferences are examined on the basis of the Chernobyl releases and their decay properties. The technique is based on a plastic scintillator β detector and a guard ring of BGO counters which can be logically connected in coincidence and anticoincidence. The evaluations show that a few hours are sufficient to determine a specific activity comparable with the Maximum Permissible Concentration in air by sampling 10 m3. © 1990 Health Physics Society Pergamon Press plc.
D Brini, G.M. (1990). A proposed multi-detector method for prompt90sr detection in post-accident environmental matrices. HEALTH PHYSICS, 58(3), 329-339 [10.1097/00004032-199003000-00011].
A proposed multi-detector method for prompt90sr detection in post-accident environmental matrices
D Brini;G. Maltoni;M. P Morigi;V. Prodi;C. Volta;
1990
Abstract
Strontium-90 is of relevant biological importance among fission products released during a fission reactor accident. Rapid information on its concentration in environmental matrices is extremely valuable, yet this implies chemical separations and handling with a shift in daughter equilibrium and therefore the need to wait a sufficient time for the equilibrium to be reestablished. The work concerns a feasibility study of a multi-detector system for a prompt evaluation of the90Sr activity or, at least, a prompt determination of its order of magnitude in the presence of other pure β and β-γ emitters; their interferences are examined on the basis of the Chernobyl releases and their decay properties. The technique is based on a plastic scintillator β detector and a guard ring of BGO counters which can be logically connected in coincidence and anticoincidence. The evaluations show that a few hours are sufficient to determine a specific activity comparable with the Maximum Permissible Concentration in air by sampling 10 m3. © 1990 Health Physics Society Pergamon Press plc.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
