Correspondence, minutes of meetings, lectures, experimental notebooks, research notes, manuscripts, and reprints of articles, publications, biographical papers, and records of commissions, congresses, and symposia, documenting Gray's career. Includes notebooks reflecting his work as the first director of the British Empire Cancer Campaign Research Unit in Radiobiology (1954-65) and material concerning his activities with the Medical Research Council (1946-65), Hospital Physicists' Association (1944-64), British Institute of Radiology (1952-64), U.S. National Research Council (1947-49), International Commission on Radiological Units (1934-62) and other organizations. Correspondents include Sir James Chadwick, Douglas E. Lea, and Ernest Rutherford.
