TPM-E - AAHP Special Session Part 2 Baltimore 1-2 14:00 - 18:00
|
| Chair(s): Charles Potter, Heather Pennington
|
| |
TPM-E.1
14:00 A Study of Suspension and Resuspension of Americium Surrogate Aerosol A Glen*, Sandia National Laboratories
; H Pennington, Sandia National Laboratories
Abstract: Multiple experiments were conducted to assess the impact on resuspension from the varying substrates and mechanisms. These results show variations in the size distribution of aerosol as a function of height from the source resuspension factors. Additionally, the aerosolized mass concentration and resuspension factor were evaluated. Conditions included multiple representative substrate surfaces for a range of particle sizes under varying environmental conditions. The resuspension methods utilized in this study were “full-scale” and the substrates were representative of real-world ground level conditions. The maximum resuspension factor was found to be on the order of 10-4 m-1, which is greater than most resuspension factors found in literature but represents idealized conditions due to the well constrained experimental parameters.
|
TPM-E.2
14:45 Evaluation of Neutron Production from Dispersed AmBe Source Materials M Snow*, Idaho National Laboratory
; J Cooper, Idaho National Laboratory
Abstract: Americium-Beryllium (AmBe) sources are common neutron sources employed by a variety of industries and research areas involving material density measurements such as geology, archaeology, chemistry and environmental monitoring. AmBe sources are generally comprised of a mixture of powdered AmO2 and Beryllium that has been pelleted and encased in a steel cylindrical container. Should the containment of the source be breached, AmBe could pose serious health hazards to those exposed. While the health hazards associated with Am (alpha emitter) or Be (chemical pneumonitis) individually are well known, little information exists regarding the hazards due to potential neutron radiation dose of dispersed AmBe particles. In this work, we characterize dispersed AmBe particles taken from partially dismantled, commercially available sources from two different manufactures. The neutron dose of dispersed AmBe particles is measured via neutron counting and the distribution of Am and Be within the source particles are investigated via electron microscopy and X-ray spectroscopy. Finally, an MCNP model for neutron flux of AmBe particles of various sizes and Am-Be distribution geometries is produced and correlated with experimental results.
|
TPM-E.3
15:30 Break
|
TPM-E.4
16:00 The Economic Impact of Radiological Dispersal Device Events LC Trost*, Sandia National Laboratories
; VN Vargas, Sandia National Laboratories
Abstract: A radiological dispersal device (RDD), used by terrorists, can have a significant economic effect. Sandia National Laboratories has done a series of studies to quantify the economic effects of RDD incidents in urban and rural, agricultural areas. We have developed a rigorous methodology to examine the physical and economic effects and the factors that drive the impact. We have found that the effects can be quite profound in either area, the resilience of different areas varies greatly, and that psychosocial effects are the most significant. We have also found that response protocols, readiness, resource availability, and response threshold determine cost and human impact to a great extent: resilience and preparedness will make a difference.
|
TPM-E.5
17:00 AAHP Business Meeting
|
