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Hi, all. Long story short, I need some help from any FR science geeks or professionals out there. My resources are limited. Simply, there are two very diverse figures provided for the radioactivity of Potassium-40. One is the figure 0.0000071 Ci/g, best-sourced from this Fact Sheet from Argonne National Laboratory. https://www.remm.nlm.gov/ANL_ContaminantFactSheets_All_070418.pdf Others are the approximately- corresponding figures of 818 pCi/g, 30 kBq/kg (800 pCi/g, or 810 pCi/g, depending on which converter you use) and 8.54E-10, one of which is cited in the National Research Council book, Evaluation of Guidelines for Exposures to Technologically Enhanced Naturally Occurring Radioactive Materials...the basis of...

OAK RIDGE - Production of radioisotopes, a signature mission at Oak Ridge National Laboratory since the 1940s, is making a comeback of sorts. Last year, there was virtually no money available for the work at ORNL while the government's isotopes program was reviewed and reorganized at Department of Energy headquarters in Washington. Production of some radioactive elements - notably californium-252, which was in short supply - got put on hold in Oak Ridge during a situation that some characterized as a bureaucratic crisis. As 2009 came to a close, however, the supply of californium, a radioisotope with uses ranging from...

The state Environment Department says runoff last summer from part of Los Alamos National Laboratory contained high levels of plutonium and other radionuclides. The department measured elevated levels of plutonium, americium and strontium in the runoff that resulted from a large potable water spill and several storm events in Los Alamos Canyon in July and August.