Christopher lands in controversy, did Robert Oppenheimer really try to kill Cambridge University tutor?

economictimes.indiatimes.com:

Oppenheimer’ has landed in yet another controversy. Did the scientist really want to poison the tutor he dislike, change his mind later and somehow save the man from dying? As the director and producer claim that the movie is based on the actual life and biography of the father of the atomic bomb, this question becomes important and demands an explanation. The film traces the life of Robert J Oppenheimer from his early days to becoming the father of the first atomic bomb and the time when he was accused of being anti-national and communist. The biopic ‘Oppenheimer’ shows a sequence in which Robert Oppenheimer injects poison into the apple of Patrick Blackett, a Cambridge University tutor, he hates. Later he changes his decision and prevents the tutor to eat the poisoned apple. But it is not clear if the theoretical physicist really wanted to kill the Cambridge University tutor. Christopher Nolan was inspired by ‘American Prometheus: The Triumph and Tragedy of J Robert Oppenheimer’, written by Kai Bird and Martin J Sherwin and this incident was described in the book. But talking to the 'Time’ magazine, the physicist’s grandson Charles Oppenheimer called it a ‘historical revision’. But ‘American Prometheus’ claims that Oppenheimer himself described this incident, but it is not clear if the incident has been exaggerated. Another point of contention in this controversy is the nature o the poison. The book suggests that a non-lethal poison might have been injected and not cyanide. Another book, ‘A Life Inside the Center’ written by Ray Monk also describes this incident. It also says that Oppenheimer’s intention might have been to make the tutor seriously sick.

Did Oppenheimer try to kill the Cambridge University tutor