PRINCIPLES FOR THE CALCULATION OF RADIATION DOSE RATES IN SPACE VEHICLES. Report No. 63270-05-01

Technical Report · Sat Jul 01 04:00:00 EDT 1961

OSTI ID:4838164

Evans, R D

An analysis is presented which takes into account the angular distribution of the incident protons and electrons and the angular distribution of the electron bremsstrahlung. The distribution with depth in the propellant is determined for the dose rate due to protons, for the dose rate due to electron bremsstrahlung, and for the deposition of stopped protons. Whereas the dose rates for monoenergetic protons or electrons are maximum at the surface of the propellant, the deposition of protons has its minimum at the surface and increases linearly with depth up to the range of the protons. For the case of protons, the maximum surface dose rate depends primarily on the total number of protons striking the surface, and only slightly on their energy, so long as their energy is sufficient for them to clearly penetrate the surface medium. Illustrative calculations ai-e carried out for the Freden and White spectrum of protons and for the Walt et al., spectrum of electrons incident on thin-walled stainless steel vehicles carrying liquid H/sub 2/ or liquid O/sub 2/. The numerical results for O/sub 2/ would be closely similar to those for biological materials. (auth)

• Research Organization: Massachusetts Inst. of Tech., Cambridge
• NSA Number: NSA-16-021844
• OSTI ID: 4838164
• Report Number(s): AD-263476
• Country of Publication: United States
• Language: English

Related Subjects

ABSORPTION
ANALOG SYSTEMS
ANGULAR DISTRIBUTION
BREMSSTRAHLUNG
DISTRIBUTION
ELECTRONS
HYDROGEN
LIQUIDS
LOW TEMPERATURE
MATHEMATICS
NUMERICALS
OXYGEN
PROPULSION
PROTONS
RADIATION DOSES
SPACE APPLICATIONS AND TECHNOLOGY
SPACE VEHICLES
SPECTRA
STAINLESS STEELS
SURFACES
THICKNESS
TISSUES