fission-track dating
/ˈfɪʃənˈtræk/noun
mass noun
- Geology a technique for establishing the age of a mineral sample from its uranium content. It involves microscopically counting tracks produced by uranium fission fragments and then establishing the existing concentration of uranium by counting again after irradiating the sample with neutrons【地质】裂变径迹计时, 裂变径迹定年。