[@Perillo1996]. The samples were left sealed and archived in the laboratory after analysis, where they remained until the summer of 2012. The highest activity found in these samples was that of $^{131}$I which peaked at 16 Bq/L on 3/24/2011. This period of rainfall also exhibited the highest activities of the other detected isotopes.

These rainwater samples presented in Norman, et al. [@Norman2011] were reexamined during the summer of 2012 for the presence of $^{90}$Sr. Isotopes of strontium, in particular, are a health hazard as they are readily absorbed into bones due to its chemical similarity to calcium. Most of the fallout from Fukushima is easily observed due to the presence of high energy gamma rays which make detection via HPGe gamma spectroscopy trivial for most systems, especially those optimized for low background counting. The fission product $^{90}$Sr (t$_{1/2}$ = 28.8 years) however is much more difficult to detect. It decays via $\beta$- with Q$_{\beta}$ = 546 keV – and *no subsequent emission of gammas*. The low Q$_{\beta}$ and no gamma ray emission makes for a much trickier isotope to detect. However, the daughter, $^{90}$Y (t$_{1/2}$ = 2.67 days), also decays via $\beta$- with very weak emission of gamma rays, but 