Description:
<jats:title>Abstract</jats:title>
<jats:p>The alpha effectiveness value (k-value) for the ESR (Electron Spin Resonance) signal due to SO<jats:sub>3</jats:sub>
<jats:sup>-</jats:sup> in barite was revised by comparing the dose responses of the signal intensities to gamma rays and to 4 MeV He<jats:sup>+</jats:sup> ion doses in natural sea-floor hydrothermal barite samples actually used for dating. Of the values obtained for a synthetic, a natural old, and a natural young samples, the one for the natural young sample is tentatively adopted, which is 0.053 ± 0.006, although further works are still necessary to establish this value.</jats:p>