I work with radiation. Radiation is hard for lay people to understand, and they are all afraid of it.
The technical language in this article is not helpful for lay people, but it is for me.
You get a much larger dose of a much worse kind of radiation exposure by eating a banana than drinking a liter of this seawater.
And things like Brazil nuts, your basement, living at altitude or near certain kinds of rocks, flying, smoke detectors, or dental X-rays are much, much worse.
Not to mention higher dose medical procedures (CT, PET, SPECT, and radiation therapy). Those, however, are borderline dangerous, but there’s a trade-off. Your radiation therapy may lead to secondary cancer down the line, but your primary cancer is killing you right now.
These articles also need to mention that the actual experts – the people who know what they’re doing and understand this – agree this is the best and safest course of action. I’m not that kind of person, but I know plenty of them. I assure you, they are very cautious.