Further Update on Public Health Issues Related to Polonium-210 Investigation
21 March 2007
The Health Protection Agency is continuing to provide expert advice on the public health issues surrounding the death of Mr. Alexander Litvinenko. Throughout, our primary concern has been to protect the public.
We have carried out an extensive monitoring programme of people and places identified by the police investigation. Our investigations have confirmed there is no public health concern in the open public areas. The monitoring results received so far show that the risk to the general public from any exposure to Polonium-210 (Po-210) is likely to be very low.
TEST RESULT UPDATE
Category 1: 596 people had results 'below reporting level' - below 30mBq per day (natural levels of Po-210 in urine are typically in the range 5mBq to 15mBq per day). It is therefore unlikely that any of these people had been exposed to Po-210.
Category 2: 85 people had results above 30mBq per day in their urine, but with a dose less than 1mSv, indicating no public health risk, and no health concern to the individual, but probable contact with Po-210.
Category 3a: 35 people had results above 1mSv, but below 6mSv, indicating no public health risk, and no health concern to the individual, but probable contact with Po-210.
There are 716 results in categories 1, 2 and 3a, and these are NOT of health concern.
Category 3b: 17 people had results above 6mSv, which are not significant enough to cause any illness in the short term and any increased risk in the long term is likely to be very small.
