Improvements for ultra-microscale radiocarbon measurements at NIES-TERRA
Dr Masao Uchida1, Kanako Mantoku1, Toshiyuki Kobayashi1
1Earth system division, National Institute For Environmental Studies, Tsukuba, Japan
In our AMS facility (NIES-TERRA), the NEC 5MV tandem Pelletron AMS (15SDH-2) have been used for various environmental studies since 1996. For past 10 years, we have made improvements such as installation of a type of MC-SNICS II ionizer, reconstruction of beam lines and exchanges of related electric instruments . With this renovation, we have developed method for ultra-microscale radiocarbon analysis with development of new graphitization systems and their improved protocol. In this conference, we report validations of ultra-microscale radiocarbon measurements to 1 μgC in improved AMS system and newly developed preparation methods.
My research interests include developing and improving isotope proxies and various analytical methods and techniques, especially for compound-specific radiocarbon analysis and microscale radiocarbon analysis. For examples, those proxies are strong tool for deciphering fate and origin of biogeochemical carbon cycles and environmental pollutants in the modern and past environment realm.