This is the general point that most of the press and general public fail to appreciate when thinking about radiation risk.
Similarly after Fukushima, there were terrified articles about how radiation could be detected in fish across the Pacific. But as you say, at what level? Certainly orders of magnitude lower than your baseline exposure. We just have very accurate detectors!
Indeed, none of those articles said: "oh yeah and at these dose rates, you'd have to eat 330,000 kg of albacore to double your natural dose, and more than 10x more than that before you got a dose that has been shown to cause harm.
Similarly after Fukushima, there were terrified articles about how radiation could be detected in fish across the Pacific. But as you say, at what level? Certainly orders of magnitude lower than your baseline exposure. We just have very accurate detectors!