one other note, conventional radiophysics/health physics 'optimisation' teaches that one can not make the jump from incident x-ray photon to induced cancer... one never truly knows, at least in the realm of diagnostic radiation levels...
this is mainly from the studies on fruit flys, studies on ram testes provide us with information on cellular lifecycles which are radioresistant and radiosensitive...
this is why radiography (plain film) and fluoroscopy are considered viable approaches in medical care...
thus, these are interesting claims in the two articles and certainly worth a greater dissection of the methodology employed...