Polyepitaxial grain matching to study the oxidation of uranium dioxide by Wasik, J, Sutcliffe, J, Podor, R, Lewis, J, Darnbrough, JE, Rennie, S, Akbar Hussain, S, Bell, C, Chaney, DA, Griffiths, G, Harding, LM, Legg, F, Lawrence Bright, E, Nicholls, R, Sasikumar, Y, Siberry, A, Smith, P, Springell, R