Robert Vance Gentry (July 9, 1933 – January 28, 2020) was an American young Earth creationist and nuclear physicist, known for his claims that how radiohalos provide unambiguous evidence of both an almost instantaneous creation of granites and the young age of the earth.
https://www.youtube.com/watch?v=rTICjwUhSys
https://www.youtube.com/watch?v=rTICjwUhSys