Over‐response of tissue‐equivalent ionization chambers at low energies: Effect of high‐ Z  surface contamination | Zendy

Hedrick W. R. | Zendy; Hykes D. L. | Zendy; Starchman D. E. | Zendy

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Over‐response of tissue‐equivalent ionization chambers at low energies: Effect of high‐ Z surface contamination

Author(s) -

Hedrick W. R.,

Hykes D. L.,

Starchman D. E.

Publication year - 1984

Publication title -

medical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.473

H-Index - 180

eISSN - 2473-4209

pISSN - 0094-2405

DOI - 10.1118/1.595454

Subject(s) - contamination , ionization chamber , ionization , photon , materials science , atomic physics , chemistry , physics , optics , ion , ecology , organic chemistry , biology

Inner wall surface contamination of an ionization chamber by high‐ Z materials can produce an over‐response to low‐energy photons which is greatly underestimated by the percentage composition of the contaminant in the entire chamber. Experience with a chamber contaminated in such a manner is presented. Examples are included which illustrate the magnitude of possible clinical effects from low‐energy units which have been calibrated with a chamber contaminated with a thin layer of relatively high‐ Z material.

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