Changes in Tungsten and Cobalt Levels in Fallon, Nevada
Author Information
Author(s): Paul R. Sheppard, Robert J. Speakman, Gary Ridenour, Mark L. Witten
Primary Institution: University of Arizona
Hypothesis
Have tungsten and cobalt levels changed over time in relation to a childhood leukemia cluster?
Conclusion
The study suggests a temporal link between increased levels of tungsten and cobalt and the onset of childhood leukemia in Fallon.
Supporting Evidence
- Tree-ring analysis showed increased tungsten levels in Fallon since the mid-1990s.
- Cobalt levels have remained high in Fallon for the last 15 years.
- Fallon's childhood leukemia rate is significantly higher than the expected rate.
Takeaway
In Fallon, Nevada, the levels of certain metals in the environment have increased over time, which might be related to a rise in childhood leukemia cases.
Methodology
Dendrochemistry was used to analyze tree rings for tungsten and cobalt concentrations over time.
Potential Biases
Potential contamination of samples during collection and analysis.
Limitations
The study cannot directly link metal exposure to childhood leukemia due to the nature of environmental data.
Participant Demographics
Fallon has a population of 7,536, with approximately 2,400 children under 19 years old.
Statistical Information
P-Value
0.04
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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