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Table 1 Chemical composition and electron density of the PMMA used as the phantom material

From: Development of a PMMA phantom as a practical alternative for quality control of gamma knife® dosimetry

Component fi Z/A ρe,PMMA ρe,PMMAe,water
H 0.081 0.992162 0.639 1.155
C 0.595 0.499542
O 0.317 0.500031
unknown 0.007 0.500
  1. Legend: fi is the fraction by weight of the atom i, Z/A is the atomic number weight mass ratio, ρe,PMMA is the electron density of PMMA and ρe,PMMA /ρe,water is the ratio of the electron densities of PMMA and water