68 © The Containment of Underground Nuclear Explosions Table 4-2—-Summary of Onsite Environmental Monitoring Program Sample type Collection fraquency Description Number of Jocations Analysis Air ow. ee Continuous sampling through gasfilter & charcoal cartndge Low-volume sampling through silica gel Continuous low volume Potable water........ ... 1-liter grab sample Weekly 44 GammaSpectroscopy gross beta, Pu-239 Biweekly 16 Tritium (HTO) Weekly Weekly 7 7 Supply wells ..........0., 1-liter grab sample Monthly 16 Noble gases Gamma Spectroscopy gross beta tritium Pu239 (quarterly) Gamma Spectroscopygross beta.tritium Pu- Open reservoirs .......... 1-liter grab sample Monthly 17° GammaSpectroscopy gross beta.tritium Pu- Natural springs ........... 1-liter grab sample Monthly 9° Ponds (contaminated) ..... -liter grab sample Monthly 8° Ponds (effluent) .......... 1-liter grab sample Monthly 5 External gamma radiation levelS ..............0.. Thermoluminescent Dosimeters Semi- annually 153 239 (quarterly) 239 (quarteny) Gamma Spectroscopy gross beta.tritium Pu239 (quarterty} Gamma Spectroscopy gross beta. trittum Pu239 (quarterly) Gamma Spectroscopy gross beta, tntium Pu239 (quarterly) Total integrated exposure over field cycle “Not ail of these locanons were sampied due to inaccessibility or lack of water. Phota creat David Graham 1988 Community Monitoring Station, Las Vegas, NV.