How do you know those stories to be absolutely true? Because you read them on the internet? Those stories could easily be fabrications. Which sounds simpler to you: that springs with magical healing properties are being completely overlooked by virtually everyone on the planet because doctors are somehow hiding them (although not very well, apparently); or, that these stories were fabricated by an industry with the means, opportunity, and billion-dollar motive to do so?
Radiation isn't a magical healing property. Radiation is toxic to microscopic organisms. It is used in Chemotherapy to treat cancer. The area around Chernobyl is interesting in that the
forests are not decaying properly due to radiation in the area. Microscopic organisms can't live there.
Radiation is also damaging to humans, to a lesser degree. The trick is to kill the disease before the host. Treating yourself with radiation isn't really something I advise, and not really what is meant by natural in these discussions. Radiation is natural in nature, but not natural to humans like Vitamin C, iodine, lemon juice, various herbs like Oregano Oil, Coconut Oil, Cats Claw, Tumeric, etc, are.
The arguments like "Not everything that's natural is good for you. Rattlesnake poison is natural!" fall flat because what is meant when you hear that natural substances are better for you is that substances natural
to the human body are better for you. Not star plasma, clearly. The body recognizes things like vitamins and plants and knows how to process them.
But, the stories of people curing themselves with radioactive water are generally true nonetheless. Water form radioactive springs was
popular 100 years ago, and touted to cure disease. There is water which flows from a spring in the Grotto of Massabielle in the Sanctuary of Our Lady of Lourdes, France, a historical site where thousands of people have traveled in search of a cure since the 1800's, and still do today. The internet is
littered with stories about Lourdes. It's also a topic of discussion on forums like curezone.com and others, where people claim to have seen benefit. It's a historical miracle spot maintained by the Vatican, which maintains a hospital near the spring to accommodate visitors in search of a cure.
When radiation was first discovered, it was quickly realized that the holy water from these springs was irradiated.
http://www.radiation-hormesis.com/The major scientists working on radiation during the 1800s and early 1900s had already shown that low level radioactivity was beneficial for living things. Plants and animals grew bigger, reproduced better, had fewer cancers and infectious diseases and had a longer lifespan
...
J. J. Thompson, discoverer of the electron, found radioactivity in well water in 1903. Within a year scientists throughout the world discovered that all famous healing hot springs such as Lourdes in France or Bath in the UK were radioactive.