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Iguchi, Yukihiro; Knehira, Yoshiki; Izumi, Masanori; Fujita, Toru*; Oya, Kiyomi*
JNC TN3520 2004-001, 172 Pages, 2004/03
JNC-TN3520-2004-001.pdf:11.04MB
In the VRdose R5 version the connection with the dynamic radiation evaluation system (DRES) was the main task. DRES can calculate the dose rate field of the Fugen plant in detail. By inserting special markers into the scenario, VRdose tells DRES what changes have been made to the model. The changes are about objects that are inserted, removed, cut or moved. DRES will then calculate new dose rate fields reflecting these changes. To minimize the calculation needed for DRES, VRdose can provide a volume enclosing only the area of interest for a given scenario and give the resolution of the calculation in all axes. In addition to the DRES connection, version R5 retrieves information about the objects in the model from the Fugen object database. Among the large amount of information available, are size, weight and surface contamination of co-60 used. The wizard uses the size and weight information in the calculation of the man-work required. The surface contamination is used in a new feature that colorizes the objects after the contamination value. This makes it easier for workers to become aware of the contamination of pipes and pumps etc. R5 has been internationalized on all menus, buttons, messages and other text. VRdose can therefore be translated into any desired language. A feasibility study has been made into using Japanese characters in names and properties in the scenario. Printing of the 3D view has been implemented, which is useful for documenting. The scenario can also be printed, both as a graphical representation and in a textual report format. Other functionality that can be mentioned is output from the wizard to Cosmard and the saving of viewpoints. The manikins wear different protection masks and in version R5 the efficiency of the protection can be changed for each nuclide. Several other minor changes have been made, such as the ability to switch between extern dose and nuclide intake in the dose graph panels.
Watanabe, Ritsuko; Hirayama, Ryoichi*; Yokoya, Akinari; Terato, Hiroaki*; Tsuruoka, Chizuru*; Eguchi, Kiyomi*; Furusawa, Yoshiya*; Kobayashi, Katsumi*
no journal, ,
DNA double strand breaks (DSB) is thought to be the most critical damage for cell death. However, a considerable discrepancy is often observed between LET dependence of the frequency of cell death and that of the DSB yield. Also, several studies on the DSB yields as a function of LET have reported different tendency in the DSB-LET relationships. To obtain insight of the relationship between DSB and cell death, it is necessary to clarify the actual LET dependence of DSB. We have been discussing about the reason why the difference of the results depending on the groups. Here we will report on the results of our discussion. In particular, some points on the experimental detection system of DSB and the problems in calculation of absorbed dose (Gy) for particle beams will be discussed.