Berlin 2012 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 1: Layer properties: electrical, optical, and mechanical properties
DS 1.1: Vortrag
Montag, 26. März 2012, 09:30–09:45, H 0111
Emission of x-rays produced by peeling adhesive tape in vacuum — •Daniel Krämer, Dirk Lützenkirchen-Hecht, and Ronald Frahm — Bergische Universität Wuppertal
Adhesive tapes can produce x-rays with energies up to about 100 keV when being peeled in a vacuum. The spectra of the emitted photons were measured with an Amptek Si-PIN-Detector and their dependence on several parameters like type of adhesive tape, gas pressure and peeling speed was investigated in detail.
The mechanism for x-ray emission is: Charge separation at the peeling vertex and build-up of an electric field with an accelerating potential up to typically 100 kV, acceleration of free electrons of the residual gas, and x-ray photon production by bremsstrahlung on the tape, thus leading to continuous spectra without characteristic emission peaks. A maximum count rate was found at pMax = 10−2 mbar. Below pMax fewer photons are produced because of less molecules in the gas which could be ionized and be a source for free electrons. Above pMax the separated charges are neutralized by ions, resulting in a decreasing count rate that vanishes at ∼1 mbar.