||A new application of mass spectrometry instruments,90Sr analysis
Five isotopes of strontium element exist in the environment, four of them (84Sr, 86Sr, 87Sr, 88Sr) are stable and have natural origin while 90Sr is a radioactive isotope (T1/2=28.8 y) and originates from nuclear weapon tests and nuclear accidents. With regard to dose estimation, the 90Sr monitoring in environmental samples is essential because it easily permeates into human skeleton causing long-time radiation exposure. After the Fukushima accident, the drawbacks of the radiometric methods for 90Sr determination were revealed. Because of the necessity of rapid 90Sr analysis, attempts have been made to develop new 90Sr measurement methods using mass spectrometry instruments, such as accelerator mass spectrometry (AMS); resonant laser ionization mass spectrometry (RIMS); inductively coupled plasma mass spectrometer with dynamic reaction cell (ICP-DRC-MS); triple quadrupole inductively coupled plasma mass spectrometer (ICP-QQQ-MS) and thermal ionization mass spectrometer (TIMS).For each technique, the principles used for 90Sr analysis, and the merits along with demerits will be discussed.
VI. Terrestrial Radioisotopes in Environment International Conference on Environmental Protection