A new value of 93Zr half-life

Abstract

Liquid samples of 93 Zr were isolated from high level liquid wastes (HLLW) by means of silica gel adsorption combined with tri-N-butyl-phosphate (TBP) extraction. Thereafter its radioactivity was determined by liquid scintillation counting (LSC) and its mass concentration by multi-collector inductively coupled plasma spectrometry (MC-ICP-MS). So a new value of 93 Zr half-life was found to be (1.13 ± 0.11) × 10 6 a.

Determination of 93Zr in nuclear power plant wastes

“…This is why it is very difficult to predict its activity concentration in NPP wastes. According to most recent reports, its half-life is (1.13 ± 0.11) × 10 6 years [1] or (1.64 ± 0.06) × 10 6 years [2]. Due to its long half-life, after 1000 years it is the second significant contributor (after 99 Tc) to the fission products activity of NPP wastes [2].…”

Titanium, zirconium, hafnium

“…The half-life of 93 Zr has been determined to be (1.13 AE 0.11) Â 10 6 a. 1 The crystal chemistry of oxozirconates and zirconium oxides has been reviewed, 2 as has the role of TiO 2 as a photocatalyst in hospitals and its potential to split water molecules, 3,4 and Ti(IV) complexes as direct TiO 2 photosensitisers. 5 A review discusses the use of single-molecule, single-particle fluorescence spectroscopy to study surface reactions involving reactive oxygen species generated by photoexcitation of TiO 2 nanoparticles.…”