Accession Number:

AD0265407

Title:

FIRST-COLLISION MOMENTS METHOD

Descriptive Note:

Corporate Author:

GENERAL DYNAMICS/FORT WORTH TEX

Personal Author(s):

• FARRIES,W.C.

Report Date:

1961-09-30

Pagination or Media Count:

1.0

Abstract:

Dose rates resulting from fast neutrons that penetrate the walls of a shielded compartment are calculated by a First-Collision Moments FCM Method. The particular advantage of this method is that it can be applied to incident neutrons having arbitrary angular and energy distribution. A combination of single-scattering theory and moments-method data are used in the development of the FCM method. The results are presented in the form of a ratio of the transmitted dose rate to the initial dose rate for initial energies of 15, 10, 8, 5, 4, 2, and 1 Mev and incident angles of 30 degrees, 60 degrees, and 90 degrees. Calculated fast-neutron dose rates are compared with available measured dose rates. Author

Descriptors:

• *AIRCRAFT NUCLEAR PROPULSION
• *MOMENTS
• *NEUTRON REACTIONS
• ATTENUATION
• CURVE FITTING
• CYLINDRICAL BODIES
• ELASTIC SCATTERING
• ELECTROSTATIC ACCELERATORS
• EXPERIMENTAL DATA
• GEOMETRY
• NEUTRON CROSS SECTIONS
• NEUTRON DETECTORS
• NUMERICAL ANALYSIS
• NUMERICAL METHODS AND PROCEDURES
• SHIELDING
• TABLES(DATA)
• TEST EQUIPMENT
• TRANSFORMATIONS(MATHEMATICS)
• VEHICLES

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE