Improving Spatial Resolution of Induced Positron Annihilation Spectroscopy for Defect Characterization in Irradiated Layers
Faculty Mentor Information
Janelle Wharry and Erik Oaas
Presentation Date
7-2016
Abstract
The objective of this work is to improve the sensitivity and spatial resolution of an induced positron annihilation (IPA) spectroscopy system for the detection of material defects. The Positron Systems Inc. PS6100 is an apparatus for non-destructive testing (NDT) utilizing IPA and proprietary technology. The PS6100 operates by introducing a flux of positrons in a sample; positrons then annihilate with electrons, emitting gamma rays which are collected, and converted into the S-parameter. The S records the gamma rays that have the expected energy versus an energy altered by defects. Most NDT techniques are only capable of detecting macroscale defects. However, the PS6100 has the potential to provide a higher spatial resolution. In this work, we will test on alloy HT9 (~Fe-12Cr-1Mo) with a 2 μm deep irradiation damage layer on the one edge, which we wish to detect using IPA. The center of the probe is scanned linearly across the coupon at a spacing of 254 μm. This test will help determine the sensitivity and the error of the PS6100 to guide future testing.
Improving Spatial Resolution of Induced Positron Annihilation Spectroscopy for Defect Characterization in Irradiated Layers
The objective of this work is to improve the sensitivity and spatial resolution of an induced positron annihilation (IPA) spectroscopy system for the detection of material defects. The Positron Systems Inc. PS6100 is an apparatus for non-destructive testing (NDT) utilizing IPA and proprietary technology. The PS6100 operates by introducing a flux of positrons in a sample; positrons then annihilate with electrons, emitting gamma rays which are collected, and converted into the S-parameter. The S records the gamma rays that have the expected energy versus an energy altered by defects. Most NDT techniques are only capable of detecting macroscale defects. However, the PS6100 has the potential to provide a higher spatial resolution. In this work, we will test on alloy HT9 (~Fe-12Cr-1Mo) with a 2 μm deep irradiation damage layer on the one edge, which we wish to detect using IPA. The center of the probe is scanned linearly across the coupon at a spacing of 254 μm. This test will help determine the sensitivity and the error of the PS6100 to guide future testing.
Comments
Poster #W6