11–16 May 2014
Casino Conference Centre
Europe/Prague timezone

In-beam neutron activation analysis at FRM II, Garching

12 May 2014, 17:15
1h 30m
Casino Conference Centre

Casino Conference Centre

Reitenbergerova 4/95, Mari&#225;nsk&#233; L&#225;zn&#283;, Czech Republic <font color=white>
Poster Nuclear Analytical Methods Poster Session - Nuclear Analytical Methods

Speaker

Dr Krzysztof Kleszcz (Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II))

Description

The thermal equivalent neutron flux at the prompt gamma activation analysis (PGAA) facility at the Forschungsneutronenquelle (FRM II) at Garching, Germany is 6x1010 cm–2 s–1 which is the highest beam flux reported. This beam intensity is already strong enough to activate samples for the purpose of neutron activation analysis (NAA), too. This option has been used together with PGAA simply performing decay counting after switching off the beam using the same spectrometer used for the in-beam measurement, and proved to be useful in the case of a handful of elements, like Na, Mn etc. The main advantage of in-beam activation is that the beam contains no epithermal or fast neutrons, thus realizing activation in its purest form. Many elements, like Al, Sb, or Ge could not be analyzed in this way, because they appear in the spectral background. Recently, a low-background counting chamber has been installed a few meters away from the PGAA instrument using a 30-% HPGe detector equipped with a mechanical cooler and covered with 10 cm of lead, boron and lithium-containing sheets against neutrons and tin to attenuate lead x-rays. The background conditions are much better for this spectrometer, at the same time the counting efficiency is also higher. This enables us to analyze a larger number of elements off-line. The first results will be presented at the conference.

Primary author

Dr Krzysztof Kleszcz (Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II))

Co-authors

Dr Petra Kudejova (Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II)) Dr Zsolt Revay (Technische Universität München, Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II))

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