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. 2014 May 6;4:4716. doi: 10.1038/srep04716

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Decoration of dislocations by He bubbles: (a) dislocation (indicated by white circle) formed during 2 keV He⁺ irradiation of ultrafine tungsten at 950°C at a fluence of 3.1 × 10¹⁹ ions.m⁻²; and (b) bubbles (indicated with black arrows) observable on the dislocation at the slightly higher fluence of 3.4 × 10¹⁹ ions.m⁻².