UC Berkeley Nuclear Air and Rain Monitor

UC Berkeley Nuclear Engineering Air and Rain Monitoring Station

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UC Berkeley Nuclear Engineering Air and Rain Monitoring Station

UC Berkeley

Results Log 3/26 (10:45am): Air sampling results posted for 3/22 – 3/24. We have observed correlated increasing trends in Cs-137 and I-131 with the water sampling results. Te-132 seems to have increased more in air than in the rain water. Full understanding of the these trends may not be understood for some time until we start to combine this data with other information. Levels remain extremely low, but we are maintaining a close watch on these trends.

3/26 (9:45am): Rain water results posted for the past few days. Delay was due to testing of new data analysis chain script that will make posting results more efficient. We have observed a sharp up-tick in Cs-137 levels from around 0.2 Bg/L to 0.55 Bq/L. I-131 had a sharp rise on 3/23 of I-131 concentration from 6 Bq/L to 20 Bq/L. I-131 levels returned to 6 Bq/L on 3/24. Reasons for the I-131 spike is still unknown. Te-132 and I-132 levels remain relatively constant.

3/24 (2:40pm): Our new air sampling results are now posted. These results should be considered preliminary because we are trying to learn more about the efficiency of our 0.3 micron HEPA filters for capturing the particles of interest (we have assumed 100% efficiency for our current calculations). We thank everyone for their patience as we worked to ensure we had the correct calibration for these measurements.

According to our measurements, the exposure to the public is very low — at the highest levels we measured, breathing the air for 2,000 years would increase one’s radiation dose by the same amount received by taking a cross-country airplane flight.

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