Theoretical Background of the Dosimetry System 86 (DS86) : I. DOSIMETRY

概要

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DS86 is a calculation code system for the estimation of the radiation dose of atomic bomb survivors at Hiroshima and Nagasaki. The DS86 calculation process is as follows: 1. Compute free-field radiation environment Radiation transport calculation can be done for the free air field at Hiroshima and Nagasaki. 2. Compute shielded radiation enviromnent Depending on each shielding situation, the shielding can be calculated by using either the Nine-Shielding Parameter or the Globe Shielding Data. 3. Compute radiation environment at the organ site Organ kerma and fluence spectra can be calculated using a transport calculation code depending on each survivor sex, age, orientation and posture. DS86 is designed as a modular data base processor. The link of transported radiation is shown in Fig. 1. The neutrons and gamma-rays emitted from the radiation source (atomic bomb) are calculated by a forward transport process. Next, adjoint calculation for house shielding is done. Finally, the organ dose is obtained by a coupling of the house-man surface using an adjoint technique.