Papers of the Medical Research Council Medical Cyclotron Unit (MRCMCU), 1934-1961, comprising records relating to the Radium Beam Therapy Research Committee, 1933-1945; and records, including case registers, of treatment carried out using the radium beam and linear accelerator, 1934-1960.

Journal kept by John Gallop during the building of the MRC Cyclotron Unit, Hammersmith, 1949-1956, plus reports, correspondence and photographs, regarding the MRC cyclotron and many in American institutions. The 'MRC Policy' files contain reports and correspondence generated during the planning and execution of the cyclotron project, and give a good picture of the background negotiations as well as the day-to-day administration. Gallop's tutorial to the Stafford Hospital Postgraduate Medical School (G.1) summarises his view of the process. Both Gallop and J W Boag sent detailed reports of the cyclotrons which they visited in the USA in 1949-1950 (C.1-6), which Gallop prepared for publication (C.7) and lectures (C.8). The correspondence in Sections D and E contains further reports, and the personal correspondence (Section F), especially the letters from Boag, includes further thoughts on cyclotron development and use.