---
title: "New evaluation of alpha decay half-life of 190Pt isotope for the Pt-Os dating system • CBPF Index"
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**Physics Note****Published**

# **New evaluation of alpha decay half-life of **190^{190}190**Pt isotope for the Pt-Os dating system**

**M.L. Terranova; Emil de Lima Medeiros**

12/20/2005

[**Download PDF **1.1 MB](https://index.cbpf.br/files/publicacao/6ad2a767639f62b11adba81b/pdf) [**Contact owner**](mailto:oaptavares@cbpf.br?subject=New%20evaluation%20of%20alpha%20decay%20half-life%20of%20190Pt%20isotope%20for%20the%20Pt-Os%20dating%20system)

## **Publication details**

<dl>

<dt>Authors</dt>
<dd>M.L. Terranova; Emil de Lima Medeiros</dd>

<dt>Type</dt>
<dd>Physics Note</dd>

<dt>Status</dt>
<dd>Published</dd>

<dt>Publication date</dt>
<dd>20/12/2005</dd>

<dt>Description</dt>
<dd>A semiempirical model based on the quantum mechanical tunnelling mechanism of alpha emission from nuclei has been used to evaluate the half-life of the Pt isotopes. For the important naturally occurring $^{190}$Pt isotope, the radiogenic parent in the $^{190}$Pt$\rightarrow ^{186}$Os dating system, the model yielded a half-life value of $(3.7\pm 0.3)\times 10^{11}$~y. This is comparable to $(3.2\pm 0.1)\times 10^{11}$~y which was obtained in the last direct counting experiment to measure the alpha activity of $^{190}$Pt (Tavares and Terranova, {\em Rad.\ Measurem.\ }{\bf 27} (1997) 19). A literature survey of available alpha decay half-life values for $^{190}$Pt isotope is also reported. The significant discrepancies found between data obtained by direct counting, indirect geological methods and different calculation models are analysed and discussed.</dd>

<dt>Year</dt>
<dd>2005</dd>

<dt>Number</dt>
<dd>CBPF-NF-016/05</dd>

<dt>Linked to a thesis</dt>
<dd>No</dd>

<dt>Linked to a grant</dt>
<dd>No</dd>

</dl>

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