The primary mission of Oak Ridge National Laboratory (ORNLj during World War I1 was the processing of pure plutonium metal in support of the Manhattan Project. By-products of this process include radioactive cesium-1 37 and strontium-90. Between 1943 and 1951, the Gunite and Associated Tanks (GAAT) at ORNL were built to collect, neutralize, and store these byproducts. Currently, twelve gunite t...

Background: The advantages of proton beam in radiation therapy- like small lateral scattering as well as absence of exit dose tail in the organs which are after the tumor- make it capable of delivering more treatment doses to the target and much lesser to the critical tissues near it. Materials and Methods: In this study, the Monte Carlo MCNPX code has been used to simulate a slab head phantom ...

Introduction The potential hazards posed by exposure to radiation from radon have been of great concern worldwide, since it is especially associated with increased risk of lung cancer. Some radioisotopes of radon progeny deposited in the human lungs emit β particles followed by the γ rays. While γ rays are comparatively less damaging to the respiratory system than α and β particles, it is the p...

The Oak Ridge National Laboratory's (ORNL) Distributed Active Archive Center (DAAC) is a data archive and distribution center for the National Air and Space Administration's (NASA) Earth Observing System Data and Information System (EOSDIS). Both the Earth Observing System (EOS) and EOSDIS are components of NASA's contribution to the U.S. Global Change Research Program through its Mission to Pl...

Introduction: This study, evaluate pediatric digital radiography. Due to the high rates of this test and the high sensitivity of children to ionizing radiation in comparison with adults, it is attempted to achieve near optimal conditions by reducing the dose and maintaining the image quality. The object of the study is to change the irradiation parameters such as kV and mA and ...

Authors: Steven Ashby (LLNL), David H. Bailey (LBNL), Maurice Blackmon (UCAR), Patrick Bohrer (IBM), Kirk Cameron (U. SC), Carleton DeTar (U. Utah), Jack Dongarra (U. Tenn.), Douglas Dwoyer (NASA Langley), Peter Freeman (NSF), Ahmed Gheith (IBM), Brent Gorda (LBNL), Guy Hammer (DOD-MDA), Wesley Felter (IBM), Jeremy Kepner (MIT/LL), David Koester (MITRE), Sally McKee (Cornell), David Nelson (DOE...

The Soft and Lung tissue equivalent substitute (STES LTES) were developed from urethane PMC121/30 Dry (A B) of Smooth-On, USA. part A B mixed in the ratio 1:1 further with calcium carbonate (CaCO3) at a 2:1 by mass. Air moisture was extracted mixture for 10minutes. This is STES density after air extraction 1.04gcm-3. LTES mixing polystyrene beads 10:1 0.25gcm-3 extraction. subjected to compress...