Improvement of quality in the evaluation of radium isotopes Ra-224,Ra-226,Ra-228 in oil scale samples


Okyay S., Ozden B., Asper N., Landsberger S.

JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY, cilt.322, ss.1305-1309, 2019 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 322 Konu: 3
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1007/s10967-019-06872-4
  • Dergi Adı: JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
  • Sayfa Sayıları: ss.1305-1309

Özet

Elevated concentrations of the radium isotopes Ra-224,Ra-226,Ra-228 exist in the scale and produced water in oil exploration. The activity concentration of Ra-226 was calculated from 186.2 keV peak with no usual spectral interference of 185.7 from U-235. The activity concentration of Ra-228 was calculated from its first daughter product Ac-228 using the 911.2 keV gamma rays since it is a pure beta emitter. The activity concentration of Ra-224 was calculated from Pb-212 using the 238.6 keV gamma-ray and the secular equilibrium equation with Ra-228. The IAEA 448 (oil contaminated field soil) reference material was used as a quality control for Ra-226,Ra-228 and but was unreliable for Ra-224 using Pb-212.