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Commercial nuclear innovation "new space" age
In early 2006, a start-up company launched a small rocket from a tiny island in the Pacific. It exploded, showering the island with debris. A year later, a second launch attempt sent a rocket to space but failed to make orbit, burning up in the atmosphere. Another year brought a third attempt—and a third failure. The following month, in September 2008, the company used the last of its funds to launch a fourth rocket. It reached orbit, making history as the first privately funded liquid-fueled rocket to do so.
Marcos P. de Abreu
Nuclear Technology | Volume 168 | Number 2 | November 2009 | Pages 369-372
Neutron Measurements | Special Issue on the 11th International Conference on Radiation Shielding and the 15th Topical Meeting of the Radiation Protection and Shielding Division (Part 2) / Radiation Protection | doi.org/10.13182/NT09-A9211
Articles are hosted by Taylor and Francis Online.
In this technical note we report on a slight but important modification in a recently developed backscattered neutron-based void fraction evaluation scheme for slab materials, and we describe an add-on numerical scheme for computing total (direct plus diffuse) neutron transmission through a test slab. In the void fraction evaluation scheme, the broad neutron beam consists of a monodirectional (singular), normally incident component and a smooth (regular), angularly continuous component, i.e., a mixed neutron beam. Once the void fraction of the test slab has been evaluated, the diffuse component of the angular flux of transmitted neutrons can be computed from an accurate spherical harmonics-discrete ordinates solution of the neutron beam transport problem defined in a reduced slab domain (the direct component is rather straightforward to compute). The add-on scheme described here can be used to evaluate the amount of neutrons that escape from the slab through the back side. Numerical results are given to illustrate the usefulness of our add-on scheme in neutron shielding studies.
