Hannover 2016 – wissenschaftliches Programm
MS 10.3: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
Actinide AMS at DREAMS — •Nasrin B. Khojasteh1, Silke Merchel1, Stefan Pavetich1,2, Georg Rugel1, Andreas Scharf1, and René Ziegenrücker1 — 1HZDR, Dresden, Germany — 2ANU, Canberra, Australia
Radionuclides such as 236U and 239Pu were introduced into the environment by atmospheric nuclear weapon tests, reactor accidents (Chernobyl, Fukushima), releases from nuclear reprocessing facilities (Sellafield, La Hague), radioactive waste disposal, and accidents with nuclear devices (Palomares, Thule) . Accelerator Mass Spectrometry (AMS) is the most sensitive method to measure these actinides.
The DREsden AMS (DREAMS) facility is located at a 6 MV accelerator, which is shared with ion beam analytics and implantation users, preventing major modifications of the accelerator and magnetic analyzers. DREAMS was originally designed for 10Be, 26Al, 36Cl, 41Ca, and 129I [2,3]. To modify the system for actinide AMS, a Time-of-Flight (TOF) beamline at the high-energy side has been installed and performance tests are on-going. Ion beam and detector simulations are carried out to design a moveable ionization chamber. Especially, the detector window and anode dimensions have to be optimized. This ionization chamber will act as an energy detector of the system and its installation is planned as closely as possible to the stop detector of the TOF beamline for highest detection efficiency.  Srncik et al., J. Environ. Radioact. 132 (2014) 108.  Akhmadaliev et al., Nucl. Instr. Meth. B. 294 (2013) 5.  Rugel et al., Nucl. Instr. Meth. B. in review.