THE DEPTH-DOSE DISTRIBUTION PRODUCED IN A SPHERICAL WATER-FILLED PHANTOM BY THE INTERACTIONS OF A 160-Mev PROTON BEAM

Technical Report · Wed Jul 10 04:00:00 EDT 1963

DOI:https://doi.org/10.2172/4690089· OSTI ID:4690089

Maienschein, F. C.; Blosser, T. V.

Measurements were made of the total energy deposited at various points within a 42-cm-dia spherical water-filled lucite phantom by the secondary particles resulting from 160-Mev proton reactions with various targets. Target materials were water, aluminum, carbon, copper, and bismuth. Detectors were small lucite-walled ionization chambers filled with 97% A--3% CO/sub 2/ or ethylene gas. Data were taken both with the lucite phantom on the beam axis and with the phantom offset approximately 54 deg -43' from the beam axis. The proton beam energy determined from a part of these results, 160-162 Mev, is in good agreement with published values. The energy deposited by secondary particles was found to increase with Z, as expected. The depth-dose curves obtained have a steeply negative slope over the region near the surface of the phantom and a more gentle slope at greater depths. The magnitude of the dose in the region of the initial slope decreases with increasing target thickness. The dose in this region is presumably due to secondary protons. The magnitude of the dose at greater depths increases with increasing target thickness. At the greater depths the slope of the depth-dose curves, presumabiy controlled by secondary neutron interactions, is similar to that observed when the depth dose due to a Co/sup 60/ gamma-ray source was measured. A portion of the data is presented graphically and a complete tabulation of all results is included as an appendix. (auth)

• Research Organization: Oak Ridge National Lab., Tenn.
• DOE Contract Number: W-7405-ENG-26
• NSA Number: NSA-17-027059
• OSTI ID: 4690089
• Report Number(s): ORNL-3457
• Country of Publication: United States
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
CARBON DIOXIDE
COBALT 60
DIAGRAMS
ENERGY
ETHYLENE
GAMMA RADIATION
IONIZATION CHAMBERS
LUCITE
MEASURED VALUES
MOCKUP
NEUTRONS
PARTICLES
PHANTOMS
POLYMERS
PROTON BEAMS
PROTONS
RADIATION DOSES
TARGETS
THICKNESS
WATER