129I in precipitation using a new TOF system for AMS measurements

H. Reithmeier, V. Lazarev, F. Kubo, W. Rühm, E. Nolte

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29 Scopus citations

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 languageEnglish
Pages (from-to)273-280
Number of pages8
JournalNuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
Volume239
Issue number3
DOIs
StatePublished - Sep 2005

Keywords

  • Accelerator mass spectrometry
  • Deposition
  • Iodine-129
  • Precipitation
  • Sample preparation
  • TOF system

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