Radiation Transmission Measurements for Demron Fabric

Friedman, H ; Singh, M S

Lawrence Livermore National Laboratory

关键词: Hardening;    Lawrence Livermore National Laboratory;    Attenuation;    Shielding;    Geometry;   

DOI  :  10.2172/15007227
RP-ID  :  UCRL-ID-151234
RP-ID  :  W-7405-ENG-48
RP-ID  :  15007227

美国|英语

来源: UNT Digital Library

【 摘 要 】

Radiation Shield Technologies has requested a measurement survey of its Demron fabric to determine the shielding properties in the x-ray, gamma ray and beta particle emissions in the range of energies relevant to clinical and Homeland Security applications. It is important to perform a detailed measurement program in order to sort out the shielding properties of this material in light of the often-times complex spectra emitted by standard radio-nuclides and x-ray generators. Low energy portions of the spectra are shielded more easily by this fabric than are the higher energy components and a simple single-layer test can lead to misleading results. This concept of ''spectral hardening'' was investigated by measuring the transmission factors for many layers and extracting information from the slopes of the transmission curves thereby obtaining a true picture of the shielding properties of the material as a function of energy. After the initial measurement program was completed, the mass attenuation coefficients were calculated using the LLNL cross section data, TART code, RST supplied weight fractions and the measured density of the fabric. This code is used for the Monte Carlo simulation of coupled neutron-photon transport in 3-D geometry for shielding and other applications. With such a design tool, it is possible to ''tune'' the characteristics of the Demron fabric to meet the specific needs for a given radiation environment.