Delta ray

A delta ray is a secondary electron with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization.^[1]^: 25 The term is sometimes used to describe any recoil particle caused by secondary ionization. The term was coined by J. J. Thomson.

^ Podgorsak, E. B., ed. (2005). Radiation Oncology Physics: A Handbook for Teachers and Students (PDF). Vienna: International Atomic Energy Agency. ISBN 978-92-0-107304-4. Retrieved 25 November 2012.

[1] Podgorsak, E. B., ed. (2005). Radiation Oncology Physics: A Handbook for Teachers and Students (PDF). Vienna: International Atomic Energy Agency. ISBN 978-92-0-107304-4. Retrieved 25 November 2012.

[1]