Bibliographical noteFunding Information:
We thank C. Howard for discussions and advice. We also thank AWE for providing the depleted uranium sputtering target used in this work. D.C. acknowledges combined funding from the EPSRC and the AWE through the I-CASE program. D.C. also acknowledges funding from the ESRF through their traineeship program. Finally, we note the following copyright: UK Ministry of Defence © Crown Owned Copyright 2020/AWE.
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