Not an equal comparison, aluminum is not radiotoxic. And the human body readily metabolizes and excretes aluminum compounds. A microgram of plutonium wouldn't phase me at all and I’m sure I’ve been exposed to much more ionizing radiation in the past with an x-ray. The LD50 of plutonium is 5 micrograms per Kg so at my weight, plutonium would only become significantly dangerous to me when it approaches 500 micrograms exposure.