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Nondestructive morphological characterization of latent and etched ion tracks in PETP by SANS


Bartos, A.L.; Green, R.E.; Ruud, C.:
Nondestructive characterization of materials VII. Pt.2
Zürich: Trans Tech Publications, 1996
ISBN: 0-87849-730-7
International Symposium on Nondestructive Characterization of Materials <7, 1995, Prag>
Conference Paper
Fraunhofer IZFP ()
etching; irradiation; Materialcharakterisierung; materials characterization; neutron diffraction; Neutronenkleinwinkelstreuung; track detector

Solid state nuclear track detectors (SSNTD) are passive detectors for ionizing radation and can be used for the registration and identification of charged particles. The production of nuclear filters with defined porous radii in the µm-level is achievable with special etching procedures of SSNTD. despite a wide application of SSNTD the morphology of the latent tracks in SSNTDis the little investigated up to now. - One of the useful methods for non-destructive characterization of the morphology of these latent and etched ion tracks is the small angle neutron scattering (SANS). The investigations on SSNTD with SANS experiments were realized on the MURN facility of the pulsed reactor IBR-2 at the JINR, Dubna. The experimental results shall demonstrate the possibilities of this method for studying the morphology of latent tracks. A stack of PETP foils (the thickness of a single foil is of about 10 µm, total thickness of the stack is of about 0.8 mm) are used for the measurements. At sample positron the cross section for the neturon beam is of about 1.5 cm(exp2). the PETP samples irradiated by Kr-84 ions (energy 2.50 meV per nucleus) were investigated. The radii of gyration R(ind g) calculated from the slope of the scattering curve are of about 7 nm for latent ion tracks and move within a range of about 7 nm to 20 nm for etched tracks. The R(ind g) values are increasing with the etching time. The Guinier-plots of the etched samples show regions with different slopes, that is two R(ind g) values. The R(ind g) values measured by SANS were compared with the R(inde) values measrued by a conductometric method.