A new precision measurement of the α-decay half-life of 190Pt

A laboratory measurement of the alpha-decay half-life of 190Pt has been performed using a low background Frisch grid ionisation chamber. A total amount of 216.60(17) mg of natural platinum has been measured for 75.9 days. The resulting half-life is (4.97+-0.16)x10e11 years, with a total uncertainty of 3.2%. This number is in good agreements with the half-life obtained using the geological comparison method.