@misc{oai:repo.qst.go.jp:00065541,
 author = {Nor, Kavasi and Sarata Kumar, Sahoo and Arae, Hideki and Aono, Tatsuo and Yoshida, Satoshi and Kavasi, Norbert and Sahoo, Sarata and Hideki, Arae and Tatsuo, Aono and Satoshi, Yoshida},
 month = {Sep},
 note = {There is an increasing interest on Sr-90 measurement in environmental samples after the Fukushima Daiichi nuclear power plant (FDNPP) accident since it is a bone seeker isotope with high toxicity. Radioactive strontium, cesium and plutonium isotopes are the main contributors of radioactive contamination for many years after FDNPP accident due to their longer half-life. Radiocesium (Cs-137, Cs-134) deposition is significantly high over a large area in Japan owing to the FDNPP accident. Consequently, the presence of radiocesium in environmental samples collected from contaminated fields is obvious. 
Sr-90 is a pure beta emitter radionuclide thus separation from self-absorptive sample matrix and other disturbing beta emitter radionuclides is required. Most of the Sr-90 separation methods are based on precipitation, liquid-liquid extraction, ion-exchange chromatography and extraction chromatography. Recently extraction chromatography using selective Sr resin is the most popular method since it is easy to handle and simple to use. Disadvantages of the Sr resin, such as strontium retention decrement in the presence of elevated amount of calcium, high lead and tetravalent actinides retention are well known and overcome.
In our work, Sr-90 specific activity were analysed in soil samples affected by FDNPP accident. Each sample had elevated radiocesium specific activity, the average of Cs-134 was 46 (5.5-120) Bq/g while the average of Cs-137 was 91 (11-230) Bq/g, respectively. The perfect separation of radiocesium from Sr-90 is a cardinal point to gain accurate Sr-90 result as the radiocesium also undergoes beta decay emitting gamma-rays. Furthermore, there is another problem, i.e. of high iron concentration in Japanese soils.
In our laboratory, an efficient separation procedure was established to remove radiocesium and iron from soil samples to produce required samples for a liquid scintillation counter. In addition to radiometric detection methods, mass spectrometric methods show excellent prospects in nuclear measurements techniques. Thus, separation procedure development has been aimed for thermal ionization mass spectrometry., The 9th International Symposium on the Matural Radiation Environment(NRE-IX)},
 title = {Analytical method development of Sr-90 measurement in soil samples affected by the Fukushima nuclear accident},
 year = {2014}
}