Abstract:
:The use of Green's function has played a fundamental role in transport calculations for high-charge high-energy (HZE) ions. Two recent developments have greatly advanced the practical aspects of implementation of these methods. The first was the formulation of a closed-form solution as a multiple fragmentation perturbation series. The second was the effective summation of the closed-form solution through nonperturbative techniques. The nonperturbative methods have been recently extended to an inhomogeneous, two-layer transport media to simulate the lead scattering foil present in the Lawrence Berkeley Laboratories (LBL) biomedical beam line used for cancer therapy. Such inhomogeneous codes are necessary for astronaut shielding in space. The transport codes utilize the Langley Research Center atomic and nuclear database. Transport code and database evaluation are performed by comparison with experiments performed at the LBL Bevalac facility using 670 A MeV 20Ne and 600 A MeV 56Fe ion beams. The comparison with a time-of-flight and delta E detector measurement for the 20Ne beam and the plastic nuclear track detectors for 56Fe show agreement up to 35%-40% in water and aluminium targets, respectively.
journal_name
Radiat Environ Biophysjournal_title
Radiation and environmental biophysicsauthors
Shinn JL,Wilson JW,Schimmerling W,Shavers MR,Miller J,Benton EV,Frank AL,Badavi FFdoi
10.1007/BF01211542subject
Has Abstractpub_date
1995-08-01 00:00:00pages
155-9issue
3eissn
0301-634Xissn
1432-2099journal_volume
34pub_type
杂志文章abstract::It is usually assumed that sparsely ionizing radiation produces randomly distributed DNA breakages. This seems to be supported by the finding that in some DNA fragments single-strand scissions occur uniformly at all nucleotide sites, regardless of sequence. We performed experiments on two DNA fragments of about 300 bp...
journal_title:Radiation and environmental biophysics
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journal_title:Radiation and environmental biophysics
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