Half-life of 90Sr — measurement and critical review

摘要: Abstract Recent evaluations of the half-life 90Sr have demonstrated variable quality available experimental data which has prevented estimation and adoption a value that commands confidence. In an attempt to reduce uncertainty in acceptable level, decay source been followed for over six years at NPL. The equipment comprised matching, re-entrant, high-pressure ionization chambers long-lived reference non-random effects. technique is described together with statistical procedure used analyse measured data. A was determined estimate associated uncertainties. new evaluation made, taking account NPL other recent measurements. Particular attention paid techniques produce uncertainties attributed them. An objective conducted recommended 10 516 ± 21 days.