Matesh N. Varma

Energy deposition in nanometer regions by 377 MeV/nucleon /sup 20/Ne ions

Dose as a function of radial distance from a /sup 20/Ne ion beam was determined. These ions had 377 MeV/nucleon energy and were obtained at the Bevalac facility of Lawrence Berkeley Laboratory. A variable pressure ionization chamber and a double-mesh wall ionization chamber (approximating a wall-less ionization chamber) were used. Linear energy transfer restricted in distance (LET/sub r/) was also determined and the data were extrapolated to obtain LET/sub infinity/. Simulated distances studied were from about 58 A to 1010 ..mu..m of tissue assumed to have a density of 1 g/cm/sup 3/. Experimental results were compared with theoretical calculations; the experimental values on the average were lower by about 6% over the range of distances studied.

Energy Deposition by Heavy Ions in a "Tissue Equivalent" Gas'

Energy deposited by heavy ions as they pass through gaseous media was measured as a function of radial distance from their tracks. The experimental values are compared to Paretzkes (1) theoretical...

Radial dose, LET, and W for 16O ions in N2 and tissue-equivalent gases.

Average energy to produce an ion pair (W), distance restricted, and total linear energy transfer and dose as a function of radial distance D(r) from the ions path were measured for 41.1-MeV16 O ions in nitrogen and Rossi-type tissue-equivalent gas Results for W were 38.9 ± 0.54 eV/ion pair for nitrogen and 33.4 ± 0.47 eV/ion pair for tissue-equivalent gas. Results for total linear energy transfer (

Stopping power and radial dose distribution for 42 MeV bromine ions

{\rm LET}_{\infty}

Energy dependence of W for alpha particles in N2, CO2, CH4, Ar, H2 and Rossi-type tissue-equivalent gases

) were

Stopping power and average energy to form an ion pair for 42 MeV oxygen ions

6507\ {\rm MeV}\cdot {\rm cm}^{2}\ {\rm g}^{-1}

Hit-Size Effectiveness Approach in Biophysical Modeling

for tissue-equivalent gas and

The Agent Carrier and Transfer Approach to Radiobiological Responses

6210\ {\rm MeV}\cdot {\rm cm}^{2}\ {\rm g}^{-1}

Auger electron and characteristic energy loss spectra for electro-deposited americium-241

for nitrogen. Results for D(r) were used to calculate similar values to be expected in tissue-like material having a density of

Device for precise measurement of charged particle beam intensity

1\ {\rm g}/{\rm cm}^{3}