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Past experiments measuring the decay rates of beta emitting radioactive elements have observed periodic modulations of the expected exponential decay with amplitudes of a few parts per thousand. One proposed explanation is that beta decay rates are influenced by the solar neutrino flux incident on the Earth, which varies by approximately 7% with the time of year. Other modulation frequencies are sometimes also seen and may correlate with rotational and various oscillatory modes of the sun. We measure the decay rate from 1 microCi of Cs-137, and 1 microCi Am-241 mounted on one detector, with enough statistical precision (better than one part in a thousand) to detect such effects and determine if they are real or instrumental /environmental. The experimental apparatus continuously collects data in 3-minute cycles to minimize the effects of temperature-induced gain shifts. The strong-interaction alpha decay of Am-241 serves as a control for possible instrumental effects, under the assumption that modulations involve only weak beta decays and not strong decays. Each cycle gives a 1024-channel energy spectrum, which is energy-scaled using the sharp Cs-137 gamma ray peak to negate gain drift. Decay rates are calculated by counting the events in a fixed set of energy bins. Data collection started in May 2013 and has run almost continuously since, with a two-week interruption in October 2013. There are no obvious periodic modulations in the counting rate. Data extending continuously for more than a year will allow us to quantify or set limits on annual modulation.

Searching for Trends Superimposed on the Exponential Decay Rate of Cs-137