68 @ The Containment of Underground Nuclear Explosions Table 4-2—Summary of Onsite Environmental Monitoring Program Sampie type Collection frequency Description Number of locations Analysis Ain eee Continuous sampling through gasfilter & charcoal cartridge 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 Nobile gases GammaSpectroscopygross beta.tritium Pu- Supply wells ............. 1-liter grab sample Monthly 16 Gamma “oectroscopy gross beta,tritium Pu- Open reservoirs .......... 1-liter grab sample Monthly 17° Natural springs ........... 1-liter grab sample Monthly 9° Ponds (contaminated) ..... 1-liter grab sample Monthly 8" Ponds (effluent) .......... 1-liter grab sample Monthly 5 External gamma radiation levelS ..............00. Thermoluminescent Dosimeters Semi- annually 153 239 (quarterly) 239 (quarterly) GammaSpectroscopy gross beta, trittum Pu239 (quarterly) GammaSpectroscopygross beta.triturn Pu- 239 (quarterly) Gamma Spectroscopy gross beta, tritium Pu239 (quarterly) Gamma Spectroscopy gross beta, tntium Pu239 (quarterly) Total integrated exposure over field cycle “Notail of these locations were sampied due to inaccessibility or lack of water. Photo credit David Graham, 1988 Community Monitoring Station, Las Vegas, NV.