In a recent paper, Tendler et al, demonstrated visualization of Cherenkov light from a human radiotherapy treatment, and examines the light emission for spectral confirmation of the origins of the signal.
Tendler et al, IJROBP, February 1, 2020 106(2), pp 422–429.
https://www.redjournal.org/article/S0360-3016(19)33947-1/fulltext