Abstract
Cascade defect structures in gold irradiated with 14 MeV neutrons were investigated by TEM observations and computer simulations. Irradiations with the RTNS-II and TEM observations were performed repeatedly at room temperature with the microstructures being examined at the same position of the specimen. Computer simulations were carried out with the MARLOWE code taking into account the PKA spectrum. ‘Cut-off calculations’ were performed to derive the number and spatial distribution of subcascades. The TEM observations revealed the possibile evidence of apparent subcascade image formation even at very low doses ( 6.6 × 10 19 / m 2 ), indicating the need for careful stereoscopic examination. The TEM results were in good agreement with the computed number and spatial extension of subcascades with an energy of about 20 keV. These results are in good agreement with the result obtained for heavy ion irradiations, which suggests a cascade modeling method applicable to various types of irradiation.
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