Quantitative imaging of radioactive Sr-90 using laser ablation-inductively coupled plasma-mass spectrometry

Yanagisawa, Kayo; Matsueda, Makoto   ; Furukawa, Makoto*; Hirata, Takafumi*; Takagai, Yoshitaka*

LA-ICP-MS technique, both the elemental and isotopic mapping analyses can be made with high sensitivity over the traditional techniques such as XRF, EPMA, and SIMS. However, detection of Sr-90 is still challenging because of contributions of spectral interferences and tailing from neighboring abundant isotopes. To reduce the contribution of various interferences, ICP-MS/MS and reaction cell technique was adopted in this study. With the present analytical technique, the detection limit obtained from analysis area (100100 m square) was 0.64 mBq. The measured background intensity at m/z 90 u (1.62.2 cps) did not change significantly even under the presence of various interfering elements (Ni: 2,084 mg/kg, Ge: 21 mg/kg, Y: 23,004 mg/kg, Zr: 175 mg/kg). The measured abundance sensitivity on Sr-90 from Sr-88 was 2.6e-9. The data indicates sensitive and rapid analytical technique for the mapping analysis of both Sr-90 and other trace-elements.