Document Type

Report

Publication Date

3-1991

Abstract

MCNP version 3B was modified to incorporate a continuously variable density atmosphere. This was accomplished by representing the variation of air density as a function of altitude with a series of continuous piecewise exponential curves up to a maximum altitude of 1000 km. User-written subroutines and functions were written which incorporated these piecewise functions. These subroutines and functions were subsequently incorporated into a production version of MCNP. Several MCNP subroutines and files were modified in support of these modifications. This report discusses detailed information regarding the theoretical development of the variable density model, the user written subroutines and functions, the modifications to MCNP subroutines and files, and other relevant information.

Comments

This report was published as the Addendum to the AFIT Masters thesis of David Monti, AFIT/GNE/ENP/91M-6.

Alternative report number format: AFIT/EN-TR-91-2

DTIC Accession Number

ADA231425

Document / Report Number

AFIT-EN-TR-91-2

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