Portal de Periódicos da CAPES

A measurement of the half-life of 137Cs

1990; Elsevier BV; Volume: 286; Issue: 3 Linguagem: Inglês

10.1016/0168-9002(90)90906-m

1872-9576

Robert H. Martin, John G. Taylor,

Scientific Measurement and Uncertainty Evaluation

The half-life of 137Cs has been found to be 10967.8±4.5 d where the uncertainty combines Type A and Type B components equivalent to one standard deviation. A purified source of 137Cs was measured in an ionization chamber for eight years relative to three 226Ra reference sources. Allowance was made in the least squares fitting procedure for a small contribution from 134Cs (0.027% initially) and for 210Bi growing towards equilibrium in the reference sources.