has a much higher end point energy of Q$_{\beta}$ = 2.280 MeV which makes detection easier.

The method used to isolate $^{90}$Sr involved introducing stable strontium to the rainwater samples and creating a precipitate, which would act as a carrier to also extract any $^{90}$Sr that may be present. Four rainwater samples, each approximately 1L in volume, collected between March 18-23 in Albany, Oakland, and Berkeley CA were selected for $^{90}$Sr testing. A control sample of tap water was also analyzed. Approximately 100-140 mg of SrCl$_{2}$ was dissolved in each sample followed by 200-250 mg of K$_{2}$CO$_{3}$ , which immediately turns the water sample a cloudy white color due to the formation of a SrCO$_{3}$ precipitate. The precipitate was then filtered out of solution onto a paper filter and dried, which was weighed before and after to obtain a precipitate mass. For every 1 mg of SrCl$_{2}$, it is expected to produce 0.931 mg of SrCO$_{3}$. The experimental conversion we achieved averaged 91.61% of the expected precipitate mass for the five samples. The filter and precipitate was then laminated in a strip of packing tape. X-ray fluorescence was performed on the samples to confirm that the precipitate samples did indeed 