The people I worked with at Rocky Flats were experts on handling radioactive materials and limiting exposures and managing risks associated with plutonium and other radioactive and potentially hazardous materials. They were committed to controlling emissions to the lowest possible levels since, after all, many lived with their families close to (even downwind of) the Plant. However, an issue that continues to receive attention is the health risks of low-level plutonium emissions that occurred during the nearly 60 year operations and cleanup of the RF site. GotheBetterWay.org opposes a proposed beltway that is proposed to be constructed near the Rocky Flats site, and mentions concerns about plutonium contamination.
In an exchange with a commentator, I used the comparative term “very little” to describe an average of 0.006 ounces plutonium per year emitted from routine operations that processed tons of the material at the RFPlant. This is equivalent to 0.2 ppm emission (99.999% capture) for a processing rate of one ton per year. The commentator responded that “very little” was inappropriate, since his research found “billions of particles per acre.”
This “billions per acre” seems an impressive number until put it in context with concentrations of radioactive elements — and plutonium, in particular — from worldwide fallout (discussed in chapter 25 of the book on this site). The book, “Transuranic Elements in the Environment,” indicates measured fallout levels of plutonium per square kilometer in northern hemisphere soils ranged from 0.1 to 2.2 millicuries (mCi = 0.001 Ci). This is equivalent to some 10 to 300 million billion (i.e., quadrillion) atoms per acre from fallout alone, which is not connected with RFP operations. Epidemiological risk calculations suggested that exposure to fallout plutonium could result in up to 125 to 600 additional cancer deaths (of the US total 500,000 per year), but researchers could not preclude the possibility that no additional cancer deaths would result.
The health risk from radioactive materials like plutonium is an unresolved issue. I’ve posted a review of the book “No Place to Hide,” that discusses the continuing health risks created by historical atmospheric nuclear testing.