At the source is also Radiumquelle, no idea if that is also healthy. Here you can hold your legs for cooling in the stream and taste the water of the spring. A little tip: Only cold and fresh from the spring, at home it tasted like stale water from an old water pipe.
Quote Wikipedia (that's probably why it's not advertised that way):
In the 1920s, the harmful effects of radium were recognized, as many of the Radium Girls' dial paint painters in Orange, New Jersey, were shown to have cancerous tumors on their tongue and lips by the radioactive luminescence of the dial color, because they used their mouths to paint their mouths sharpened
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