The effect of scattered radiation in  6  0 Co beams on wall correction factors for ionization chambers | Zendy

McEwan A. C. | Zendy; Smyth V. G. | Zendy

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The effect of scattered radiation in 6 0 Co beams on wall correction factors for ionization chambers

Author(s) -

McEwan A. C.,

Smyth V. G.

Publication year - 1986

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 - 10.1118/1.595930

Subject(s) - monte carlo method , dosimetry , ionization chamber , physics , radiation , photon , ionization , atomic physics , stopping power , nuclear physics , computational physics , optics , nuclear medicine , ion , mathematics , detector , medicine , statistics , quantum mechanics

The A wall correction factors used in dosimetry protocols are obtained by Monte Carlo methods that assume 6 0 Co beams equivalent to 1.25‐MeV radiation. Real 6 0 Co beams contain lower energy components; in addition, A wall is defined differently by different authors. In the present work, A wall as defined by Rogers, Bielajew, and Nahum (1985) has been calculated by Monte Carlo methods at several energies, for a graphite cavity chamber, using the revised stopping‐power data of Seltzer and Berger (1982). It is concluded that the true value of A wall for chambers designed for use in 6 0 Co beams will not move more than 0.1% below the value calculated for 1.25‐MeV photons.

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