Analysis of localised dose distribution in human body by Monte Carlo code system for photon irradiation.
In usual personal dosimetry, whole body irradiation is assumed. However, the opportunity of partial irradiation is increasing and the tendencies of protection quantities caused under those irradiation conditions are different. The code system has been developed and effective dose and organ absorbed doses have been calculated in the case of horizontal narrow photon beam irradiated from various directions at three representative body sections, 40, 50 and 60 cm originating from the top of the head. This work covers 24 beam directions, each 15 degrees angle ranging from 0 degrees to 345 degrees, three energy levels, 45 keV, 90 keV and 1.25 MeV, and three beam diameters of 1, 2 and 4 cm. These results show that the beam injected from diagonally front or other specific direction causes peak dose in the case of partial irradiation.
Ohnishi
S
S
National Maritime Research Institute, 6-38-1 Shinkawa, Mitaka-si, Tokyo, 181-0004, Japan. sohnishi@nmri.go.jp
Odano
N
N
Nariyama
N
N
Saito
K
K
D049628:Body Size; D003198:Computer Simulation; D006801:Humans; D008962:Models, Theoretical; D009010:Monte Carlo Method; D009928:Organ Specificity; D017785:Photons; D011829:Radiation Dosage; D012542:Scattering, Radiation; D014018:Tissue Distribution; D014916:Whole-Body Irradiation