Abstract
A new time-of-flight set-up for accelerator mass spectrometry with 129I was installed at the Maier-Leibnitz laboratory in Garching (Germany). The detector system consists of a TOF-system and an ionization chamber. A TOF resolution of 440 ps is obtained, the energy resolution is about 2%. The sensitivity of the complete system is 10-14 for the ratio of 129I/127I. The measurements of rain water samples from the time period between July 2003 and October 2004 showed a decrease of 129I concentration, of 129I deposition flux and of 129I/127I isotopic ratio compared to previous measurements of rain water in Southern Germany from 1988, 1989 and 1995. This decrease can be explained by a substantial drop in gaseous 129I emissions from the French reprocessing facilities.
Original language | English |
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Pages (from-to) | 273-280 |
Number of pages | 8 |
Journal | Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms |
Volume | 239 |
Issue number | 3 |
DOIs | |
State | Published - Sep 2005 |
Keywords
- Accelerator mass spectrometry
- Deposition
- Iodine-129
- Precipitation
- Sample preparation
- TOF system