Neutron dosimetry at LLNL

At the Lawrence Livermore National Laboratory (LLNL), only a small number of our personnel receive neutron exposures. With a few exceptions, these personnel work in our plutonium facility. The exposures are primarily to neutrons from (1) the spontaneous fissioning of fissile material and (2) oxides of fissile material. The neutron energies range from a fission spectrum, due to work with plutonium without any shielding, down to lightly moderated spectrum, due to work in shielded glove boxes. Personnel who work in the plutonium vaults are exposed to neutron spectrum containing a large component of room scattered neutron and thermal-energy neutrons