IAEA

The link to the International Atomic Energy Agency "Fukushima Nuclear
Accident Update Log" is below:

http://www.iaea.org/newscenter/news/tsunamiupdate01.html

They provide updates fairly regularly.

The ground contamination levels within 68 km of the power plant around
March 23 are pretty amazing.

"The IAEA took measurements at additional locations between 35 to 68 km from the Fukushima plant. The dose-rate results ranged from 0.8 to 9.1 microsieverts per hour. The beta-gamma contamination measurements ranged from 0.08 to 0.9 MBq per square metre"

That's 0.08 to 0.9 *Mega* becquerels. That measurement is not isotope
specific, but the BRAWM team measured 12.42, 0.99 and 1.53 Bq/kg for
I-131, Cs-134 and Cs-137 respectively for the 4/6 sample. That's only 3
of the total range of isotopes that existed in the IAEA measurement. But,
I believe it would take a VERY high level of the other isotopes to get
from the BRAWM combined measurement of 14.94 Bq/kg (don't know how to
convert Bq/kg to the Bq/M2 used in the IAEA report) to 80,000 to 900,000
Bq per square meter the IAEA reported.

The levels have come down substantially as of 4/28. 45 of 47 prefectures
"had gamma dose rates of below 0.1 µSv/h, falling within the range of local natural background radiation levels"