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1932年Chadwick 发现了中子,六年以后Stone在美国加州Lawrence 实验室开始使用快中子治疗肿瘤病人,自1938年到1943年共收治了二百多例。虽然在一些病例中获得了意外的治愈,但是由于付作用大,特别是晚期合并症严重而终止了治疗。因而快中子治疗停止了20多年,在英国,1955年MRC医用回旋加速器在Hammersmith 医院奠基,1959年开始了快中子治疗前的放射生物学研究。Fow-ler 的著名猪皮肤实验即在这里进行,1946年治疗了第一例病人。自此以后,在欧洲,美国以及日本相继开始了快中子治疗,到1978年为止,有十个以上的单位采用了快中子治疗共收治疗两千多例病
In 1932 Chadwick discovered a neutron. Six years later, Stone began using fast neutrons to treat cancer patients at the Lawrence Laboratory in California, USA. From 1938 to 1943, Stone received more than 200 cases. Although an unexpected cure was obtained in some cases, the treatment was terminated because of the large effect, especially the advanced complications. As a result, fast neutron therapy has stopped for more than 20 years. In the United Kingdom, the MRC medical cyclotron was laid in Hammersmith Hospital in 1955. In 1959, radiobiology research before fast neutron therapy began. Fow-ler’s famous pig skin experiment was performed here and the first patient was treated in 1946. Since then, in Europe, the United States and Japan have started rapid neutron therapy. By 1978, more than ten units had used fast neutron therapy to treat more than 2,000 cases of diseases.