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Some Physical Properties of Graphite-Like Objects Obtained by γ Quanta Irradiation with Threshold Energy of 10 MeV of Pure Gaseous He, under High Pressure, in CuBe2 Apparatus



Author(s)

Roland Wiśniewski1, Teresa Wilczyńska-Kitowska2 and Piotr Mazerewicz3

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DOI:10.17265/2159-5348/2016.06.001

1. National Centre for Nuclear Research (2004-2014), 05-400 Otwock-Świerk, Poland Physics Faculty, Warsaw University of Technology (1952-ret. prof. since 2000), 00-662 Warsaw, Poland 2. National Centre for Nuclear Research (1968-2014), 05-400 Otwock-Świerk, Poland 3. National Centre for Nuclear Research, 05-400 Otwock-Świerk, Poland

A HeHPC (helium high pressure chamber) filled up with pure gaseous helium at initial pressure about 1.1 kbar was irradiated by braking γ-rays of 10 MeV threshold energy during 1.0 × 10⁵ s at the electron beam current (22-24) μА. After irradiation, the residual pressure inside was equal to 430 bar. Synthesized foils of black color and other multiple objects were found inside the HeHPC mainly at the entrance window for γ-rays made from beryllium bronze as a plug of beryllium bronze HPC, (published earlier) at the inner surfaces of the reaction chamber made of high purity copper and at the copper collector. Firstly, the element analysis, using SEM (scanning electron microscopy) and MPRA (microprobe roentgen analysis), allowed us to establish that the foils consist predominantly of carbon and oxygen and smaller quantities of other elements up to iron. Two years later some physical properties such as (low) density, (high) resistivity, magnetic (high paramagnetic) and dielectric (medium relative dielectric constant) properties were determined. A new carbon reach structure was also postulated basing on obtained diffractometer data. The second used method (see text) for element content determination, in principle, has confirmed the previous one.

Irradiation, high pressure, helium, PACS: 25.20.Dc, 25.45.De.