Looks like a trial is under way to reduce lung inflammation via the use of low-dose radiation. Has been shown to reduce inflammation from other types of pneumonia. Essentially running people through a CT scanner with a slightly higher dose of radiation, not even close to the type of radiation you would use for cancer.
https://www.clermontsun.com/2020/06/17/ohio-state%E2%80%88two-clinical-trials-use-low-dose-radiation-to-treat-covid-19-infections/
https://www.clermontsun.com/2020/06/17/ohio-state%E2%80%88two-clinical-trials-use-low-dose-radiation-to-treat-covid-19-infections/