>氦3和4是由地球的核心?tl, * *没有博士。* *你指的纸有重大缺陷。声称不应在任何受人尊敬的科学期刊如:>…的消亡georeactor即将来临。在目前的不确定性,一个不能说正是georeactor死亡将发生时,是否在下个世纪…或>在某个时间点georeactor去世后,就没有地磁场和地球上的生命永远不会是相同的。等等,没有地方在科学文章所要认真对待任何人。这是危言耸听,属于小报。这是发表在《美国国家科学院学报》上发表,这是一个有信誉的,所以我不知道它是如何通过。这是即使审核吗? No idea. But let's talk about the actual science presented in the paper. I'm not an expert on nuclear reactions so I can't comment on that actual model presented in the paper, but I can comment on the assumptions that are simply wrong. His model assumes a certain volume of uranium that exists in the core. Such a "block" of uranium doesn't exist. Uranium doesn't go in the core. He says: > The background as to why a large portion of the Earth's reservoir of uranium is expected to exist in the core, precipitate, and ultimately collect at the center of the Earth has been set forth in refs. 8–11... But refs 8–10 are actually his own papers. So he made up a theory that uranium goes in the core, completely ignoring years of published experimental work by different groups saying that uranium does *not* go into any significant amounts in the core, and then bases his story on that. This is wrong. Some related questions: //www.hoelymoley.com/q/8214/725 //www.hoelymoley.com/q/4798/725 Also note the lack of neutrinos, as mentioned by David Hammen in one of the answers, something that should happen if this was true. So your questions: > Is Herndon correct... No, he is not. > If not, what is their origin? Mantle sources with different 3He/4He ratios. There are many reasons for that. Mid ocean ridge basalts are mostly generated by melting of depleted mantle, that is, mantle that was already melted (at least) once. So it will not have too much of primordial 3He in it, and the ratio will be low. Hotspots such as Iceland or Hawaii tap a deeper mantle source that still has 3He in it, so the ratio will be higher. There are other factors that can modify the ratio. Episodes of depletion and recycling, metasomatism (by aqueous fluids or carbonatites, each with their own capability to transport U and Th), and some more than I can't think of at the moment. Anyway, there's no nuclear reactor in the core of the earth and we're not going to die due to its demise because it doesn't exist.