I remember commenting on a post where China condemned Japan for doing this.
I asked ppl there “is this actually bad or is this kind of par for the course of getting rid of the dangers left behind in Fukushima?” And most of them were like “it’s not a common occurrence but it’s not inherently dangerous and it’s not that big of a deal”
To me it looks like the vast majority of objections to this came from strategic propaganda related to domestic relations of China and/or other nations.