Abstract
We investigated a promising three-step resonance ionization scheme of strontium (Sr) 5s21S0 ⟶ 5s5p 3P1° ⟶ 5s5d 3D2 ⟶ 4dnp (or 4dnf, n = 39) using the first-step intercombination transition for the enhancement of isotope selectivity. The power broadening observed in the 2nd transition indicates that laser power of less than 0.2 mW is sufficient for saturating this transition. Isotope separation can be successfully expected with application of the 3rd transition due to the narrow width of the 4dnp (or 4dnf, n = 39) autoionization level, paving the way for analysis of trace 90Sr in environmental applications.
Highlights
Radioactive isotope determination in nature remains a topic of high research interest due to their hazardous nature [1,2,3,4,5,6]
The radioactive isotope of strontium, 90Sr (T1/2 28.8 years, βemit 0.546 MeV), is one of the several fission nuclides typically produced in large amounts from the operation of nuclear facilities. e chemical characteristics of Sr are very similar to those of calcium and may substitute for it in chemical reactions
Regarding radioactive isotope accumulation through the food chain, the Japanese government has set the limit of food contamination at the level of 100 Bq/kg [7]
Summary
Radioactive isotope determination in nature remains a topic of high research interest due to their hazardous nature [1,2,3,4,5,6]. The isotope selectivity enhancement can be achieved with the Doppler broadening reduction, through e ective multistep resonance ionization transition [14,15,16]. E optical isotopic selectivity is strongly dependent on the particular photoexcitation scheme and its resonance ionization transitions.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
