and better treatment of scattering will be used to improve the simulation model. Measurements and model validation in larger test geometries are also required before our model can be used with confidence to predict the performance of a kiloton-scale detector. We have undertaken to develop a 1000 liter scale WbLS detector for this purpose.

Acknowledgements {#acknowledgements .unnumbered}
================

We would like to thank Mike Sivertz, Adam Rusek, and Chiara La Tessa at the NASA Space Radiation Laboratory, as well as Ken Sexton for their assistance with this study. This research was supported by LDRD 12-033 of Brookhaven National Laboratory and by the U.S. Department of Energy, contract number KA2501032.

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