This study focuses on iodine-131 detected in milk samples from the Dairy Science Unit at Cal Poly, San
Luis Obispo, California following events at the Fukushima Dai-ichi Nuclear Power Plant in March of 2011.
The milk samples, collected between March 21 and April 11, 2011, were part of the Diablo Canyon Nuclear
Power Plant Radiological Environmental Monitoring Program. A correlation is made between the integrated
activity of iodine-131 found in milk and the integrated activities of iodine-131 of rainwater,
vegetation and air samples that were collected from March 19 to April 18, 2011. A comparison is then
made to previous studies conducted on dairy cattle that were administered controlled amounts of
iodine-131 through ingestion. The comparison shows good agreement to the model which states that
generally 1 percent of the activity of iodine-131 ingested by dairy cattle will be detected in harvested
milk. Considering the environmental factors and the uncertainties involved, these data and calculated
results derived from a real world situation provide an excellent application and confirmation of studies
done under controlled settings.