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Louis Harold Gray was a pioneering radiation biologist, specializing in radiation therapy for cancer. Franklin had consulted him regarding the tendency of virus samples to break down when exposed to x-rays, one of many challenging aspects of her TMV research. He suggested several remedies in response. In this follow-up letter, he offered to have her irradiated samples analyzed to determine exactly how much radiation they had absorbed.
Original Repository:
Churchill Archives Centre. The Papers of Rosalind Franklin