Environmental levels of radioactivity in the vicinity of the Lawrence Livermore Laboratory. 1973 annual report

Abstract

NOTICE "Thh report »at prepared it an jecounl a' »v.j\ iponiorcd by the United Suie* Gouromcnt. Neilrlcr Ihe Unlicd SMlet nor tlic United States Atomic Fnctty CotRsr.eui?:i. r-tr »ny of Unit employee*, nor any oflhcir contractor*. lupaiMraaurt. or HKOemployed, make* any warrinly, expeett or Implied,or Jerome* eny kpil liability ot «e*potwiblli;y foe Ittcareeuraey, ecmpleten.'** or urerulrw*! of Any tn'Termlkro. jppjratut, projut* or r/roccu citeloKd, or (eprCKt.li that ill uve would not In'rlfife privjuly uwned rt*hl*."

Lawrence Livermore National Laboratory Environmental Report 2015

“…The concentrations and distributions of all observed radionuclides in soil for 2010 are within the ranges reported in previous years and generally reflect worldwide fallout and naturally occurring concentrations. Slightly higher values at and near the Livermore site have been attributed to historical operations (Silver et al 1974), including the operation of solar evaporators for plutonium-containing liquid waste in the southeast quadrant of the site. LLNL ceased operating the solar evaporators in 1976 and no longer engages in any other open-air treatment of plutoniumcontaining waste.…”

Environmental Report 1995. Volume 1

“…Since 1973, soil samples in this area have generally shown 239+240 Pu values that are higher than background. The slightly higher values near the Livermore site have been attributed to historic operations, which included the operation of solar evaporators for plutonium-containing liquid waste in the southeast quadrant (Silver et al 1974). LLNL no longer operates the solar evaporators or any other open-air treatment of plutonium-containing waste.…”

Livermore Big Trees Park: 1998 summary results

“…Low-level plutonium contamination in the southeastern portion of the Livermore site was first documented by LLNL in 1974 (Silver et al, 1974). The activities responsible for the contamination at the southeastern portion of the Livermore site occurred between 1962 and 1976.…”