Shielding measurements for 230-Mev protons

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Nuclear Science and Engineering; (United States)

OSTI ID:6109285

Siebers, J V; DeLuca, Jr, P M; Pearson, D W ^[1]; Coutrakon, G ^[2]

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1. Univ. of Wisconsin, Madison (United States). Dept. of Medical Physics
2. Loma Linda Univ., CA (United States). Medical Center

Energetic neutrons, produced as protons interact with matter, dominate the radiation shielding environment for proton accelerators. Because of the scarcity of data describing the shielding required to protect personnel from these neutrons, absorbed dose and dose-equivalent values are measured as a function of depth in a thick concrete shield at neutron emission angles of 0, 22, 45, and 90 deg for 230-MeV protons incident upon stopping-length aluminum, iron, and lead targets. Neutron attenuation lengths vary sharply with angle but are independent of the target material. Comparing results with prior shielding calculations, the High-Energy Transport Code overestimates neutron production and attenuation lengths in the forward direction. Analytical methods compare favorably in the forward direction but overestimate the production and attenuation lengths at large angles. The results presented are useful for determining the shielding requirements for proton radiotherapy facilities and as a benchmark for future calculations.

• OSTI ID: 6109285
• Journal Information: Nuclear Science and Engineering; (United States), Journal Name: Nuclear Science and Engineering; (United States) Vol. 115:1; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
ACCELERATORS
ALUMINIUM
BARYON REACTIONS
BARYONS
BIOLOGICAL SHIELDS
BUILDING MATERIALS
CHARGED-PARTICLE REACTIONS
CONCRETES
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRON REACTIONS
HADRONS
IRON
LEAD
MATERIALS
MEDICINE
METALS
NEUTRAL-PARTICLE TRANSPORT
NEUTRON TRANSPORT
NEUTRONS
NUCLEAR MEDICINE
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUCLEONS
PROTON REACTIONS
PROTONS
RADIATION TRANSPORT
RADIOLOGY
RADIOTHERAPY
SHIELDING MATERIALS
SHIELDS
SORPTION
THERAPY
TRANSITION ELEMENTS