Approximation for Black-Body X-Ray Transport in Air

摘要

A simplified method is presented for approximating the air-transported x-ray spectrum from nuclear detonations in the atmosphere. Computational time is reduced such that a desk-top computer can provide results that match, within +- 10% for a wide range of conditions, Monte Carlo results which require about the same computation time on a Cray. The method consists of representing the black-body continuous spectrum by discrete emission windows, consulting tables of photon buildup factors for the discrete emission energies, unfolding the buildup photons by using air kerma response functions and an assumption for redistributing these photons to windows for lower energy, and applying cutoff and weighting factors to improve the correlation with the Monte Carlo benchmark calculations. 12 refs., 26 figs., 1 tab. (ERA citation 13:050000)