$^{90}$Sr were present and feeding into $^{90}$Y decays. The immediate and one-week-old counting ratios are shown in [**Figure \[fig:ratiocomparison\]**]{}, which did not yield any indication for the presence $^{90}$Sr via $^{90}$Y growth. The four samples were then stacked on top of each other for a week long counting to set limits, based upon $^{90}$Y $\beta$’s, calculated using Equation \[eq\], where N is the number of counts in the background, $\epsilon$ is the beta detection efficiency determined using a calibrated $^{90}$Sr source, V is the volume of rainwater (3.35 L) from which the precipitate was extracted, and LT is the livetime of counting. This produced a one sigma upper limit of 8.98 mBq/L for the presence of $^{90}$Sr in the rainwater samples analyzed.

$${ A }_{ ul }\quad =\quad \frac { \sqrt { 2N }  }{ \epsilon \cdot V\cdot LT } 
\label{eq}$$

    Isotope           Activity (Bq/L)         Fission Yield (%) [@englandrider]   Volatility [@Sill198897; @langowski]
  ------------ ----------------------------- ----------------------------------- --------------------------------------
   $^{90}$Sr    $<$ 8.99 $\times$ 10$^{-3}$                 5.78                                  Low
   $^{137}$Cs        0.136 $\pm$ 0.041                      6.19                                  High

  : Volatility comparisons of $^{90}$Sr and $^{137}$Cs, alongside their approximate activities or limits set for their presences in rainwater from this work and [@Norman2011]. These details are in support of $^{90}$Sr not 