Results of atmospheric transport modelling of radionuclides. (a) Backward modelling for station RN26 on Fiji. Sample of 18 January 2022, 01:00 UTC–19 January 2022, 01:00 UTC; source time 15 January 2022, 06:00–09:00 UTC. (b) Result of 3 hr forward modelling on 18 January 2022, 03:00–06:00 UTC for a release on 15 January 2022 starting at 04:15 UTC.