It's not my intention for any radiation to be left over in the final product. I just want the yeast to get as much exposure as possible. The contents of the beer should be consumable by humans without any hazards. Only a small amount of quarantined rice out of Japan has exceed safe standards (500 + Bq). The rice I'm looking for would be 200-400 Bq. That being said, humans can consume 1000-4000 Bq once and be okay. These dose rates rates can be correlated with the dose rates of medical testing in humans. The lethal limit is 1,110,000,000,000,000 Bq (1.11 x 10_15). Also, most of the radioactive element found in these grains will decay after about 70 days to more than safe levels. A 70 day brew even with lethal or cancerous levels should be more than safe to consume. Also filtering will catch 90% of any residual radiation left over after 70 days. I hope this quells concerns about makeing a poisonous brew.