Abstract
The calculation system used to develop DS02 has the same structure as DS86. DS02 can be considered a graded-up version of DS86, reflecting the progress of computer capacity and the refinement of nuclear cross section data during the past about 15 years. The main feature of the DS calculation system is that it is composed of replaceable modules for each step of dose evaluation. Main modules are divided into four parts: source terms, air-over-ground transport, shield effects and organ dose factors. Through the efforts to develop DS02, the first two modules (source terms and air-over-ground transport) of DS86 were replaced with new ones. Ionizing radiation from atomic bombs is categorized into prompt components (prompt gamma, prompt neutron, prompt secondary gamma) and delayed components (delayed gamma, delayed neutron, delayed secondary gamma). All these components in Hiroshima and Nagasaki were reevaluated using new source terms and air-over-ground transport calculations. The results of gamma and neutron fluence above the non-shielded ground are passed to the shield effects module and the organ factor module to reevaluate radiation dose for the survivors. [J Radiat Res 44:384 (2003)]
