Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 13: Accelerator Mass Spectrometry and Applications 3

MS 13.1: Hauptvortrag

Donnerstag, 26. März 2015, 17:00–17:30, PH/HS2

From the Earth to the Stars: AMS a versatile technique in different fields of Science. — •Gunther Korschinek — Physik-Department Technische Universität München, 85748 Garching

Modern AMS (Accelerator Mass Spectrometry) has developed since around 35 years. It started with 14C but soon spread out to long-lived radioactive isotopes of different elements. Most of the AMS facilities at present are dedicated to specific isotopes and their applications. The unique sensitivity of AMS offers applications in rather different scientific fields; from chemistry, physics, and medical science, until geo-science, extra-terrestrial-physics, and astrophysics.

After a historical remark on AMS I will introduce the method with emphasis on AMS at the Munich Tandem facility. Examples that will be discussed:

i. Measurements of 232Th and 238U in ultra clean Cu for low background detectors.

ii. 53Mn (T1/2 = 3.7My) determined in deep ocean ferromanganese crusts reveal an almost constant interplanetary dust flow (originating from the Asteroid-belt and the Kuiper-belt) on Earth during about the last 10My.

iii. 60Fe (T1/2 = 2.62My) measured in ferromanganese crusts suggested a close supernova around 2 to 3My ago. This is now supported by 60Fe determinations in ocean sediments, and in lunar samples.