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Table 1 Specification of Perspex in GEANT4

From: First steps towards a fast-neutron therapy planning program

atomic composition * physical quantities
ratio of elements: temperature = 300 K
C: 5 state of aggregation = solid (kStateSolid)
O: 2 density = 1.19 g/cm3
H: 8 for energy loss purposes:
  ChemicalFormula = "(C_2H_4)_N_Polyethylene"
  1. hydrogen in water (TS_H_of_Water) was used for the thermal scattering of neutrons; *natural composition of isotopes