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Biomedical subjects

S B Curtis

Publications and source records attributed to S B Curtis.

71 records · Page 4Linked to original sources
PubMed1973

Frequency of heavy ions in space and their biologically important characteristics.

A review of the galactic cosmic ray energy spectra of heavy ions with Z< or = 28 is presented. Fluxes of these ions within critical body organs of astronauts travelling outside the magnetosphere will be modified from the free space values by fragmentation within the spacecraft and the bodies of the astronauts themselves. The effects of such fragmentation are presented in terms of variations in the particle flux above a given dE/dx at representative depths. Present limitations to the accuracy of such calculations are considered. The validity of dE/dx as a relevant physical parameter for characterizing the biologically important component of the heavy ion radiation environment is discussed.

Cosmic Radiation↗
PubMedDate not supplied

The multiple Coulomb scattering of very heavy charged particles.

An experiment was performed at the Lawrence Berkeley Laboratory BEVALAC to measure the multiple Coulomb scattering of 650-MeV/A uranium nuclei in 0.19 radiation lengths of a Cu target. Differential distributions in the projected multiple scattering angle were measured in the vertical and horizontal planes using silicon position-sensitive detectors to determine particle trajectories before and after target scattering. The results were compared with the multiple Coulomb scattering theories of Fermi and Molière, and with a modification of the Fermi theory, using a Monte Carlo simulation. These theories were in excellent agreement with experiment at the 2 sigma level. The best quantitative agreement is obtained with the Gaussian distribution predicted by the modified Fermi theory.

Computer Simulation↗