Radium hot springs are apparently a thing also in real life.
A hundred years ago, people thought radioactivity must be good for you. Because energy! Right? How could that be harmful? Consider the case of Eben Byers, who prompted the immortal Wall Street Journal headline, "The Radium Water Worked Fine Until His Jaw Came Off".
This.....!We have a positive reaction!It is an ideal recuperation hot springs that contains sulfur, iron, and aluminium as well as radium and carbon dioxide! Roger that!!Confirmed!!!First construction team head out! On the double!