Abstract
Thermal desorption of He from various graphite samples irradiated with 20 keV He + ions has been studied. Thermal desorption behavior of He from Poco graphite was slightly different from that of Isograph-88 and above a dose of approximately 10 18 ions/cm 2 both isotropic graphites had almost identical desorption curves with peak temperatures of approximately 330°C. In the case of the graphitized paper Papyex, the amount of released He reached a maximum at a dose of 5 × 10 17 ions/cm 2 and the peak temperature on the thermal desorption curve became constant at approximately 200°C above a dose of 1 × 10 18 ions/cm 2 . The activation energy ( E d ) for He desorption from Poco graphite increased with the irradiation dose and was estimated to be 0.72 eV for a dose of 5 × 10 16 ions/cm 2 , 0.90 eV for 5 × 10 17 and 1 × 10 18 ions/cm 2 , respectively.
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