Mr. Kan, it is getting worse (my emphasis):

Fukushima No. 1 nuclear plant, crippled by the Great East Japan Earthquake of March 11, has discharged more radiation than the infamous Three Mile Island nuclear plant in the United States, according to calculations by the central government.

It has already reached a level 6 serious accident on the International Nuclear and Radiological Event Scale (INES).

via asahi.com(朝日新聞社):Radiation from Fukushima exceeds Three Mile Island – English.

To calculate the spread of radiation using the System for Prediction of Environmental Emergency Dose Information, the Nuclear Safety Commission of Japan estimates the discharge rate for radioactive iodine per hour from the Fukushima plant based on radiation measurements taken at various locations.

Using those figures to make a simple calculation of the amount of discharge between 6 a.m. March 12 and midnight Wednesday results in figures between 30,000 and 110,000 terabecquerels. Tera is a prefix meaning 1 trillion.

The INES defines a level 7 major accident such as Chernobyl as one in which radiation of more than several tens of thousands of terabecquerels is released.

The Fukushima accident is already at a level 6, which is defined as having a radiation discharge of several thousands to several tens of thousands of terabecquerels.

The discharge of radioactive iodine at the Chernobyl accident was said to be about 1.8 million terabecquerels. The Three Mile Island accident, which was considered the second-worst accident until now, had only a limited discharge of radioactive iodine into the outside atmosphere, but was classified as a level 5 accident because of the considerable damage done to the core.

After the Chernobyl accident, residents who lived in regions with cesium levels of 550,000 becquerels ore more per square meter were forcibly moved elsewhere.

“Iitate has reached a contamination level in which evacuation is necessary,” Imanaka said. “Radiation is still being released from the Fukushima plant. The areas of high contamination can be considered to be on par with Chernobyl.”

Residents who were forced to move after the Chernobyl accident were believed to have been exposed to an average of about 50 millisieverts of radiation.

However, a study of the health of residents who lived for many years on contaminated land found that the incidence of leukemia among adults did not increase.

The increase in thyroid gland cancer was believed due to internal radiation exposure among children who drank milk contaminated by radioactive iodine when they lived in areas close to Chernobyl.

The accumulated radiation level at Iitate as of Thursday afternoon was 3.7 millisieverts.

Shigenobu Nagataki, professor emeritus at Nagasaki University, who specializes in radiation medicine, said, “Because there were no other health problems after the Chernobyl accident besides thyroid gland cancer among children, it is unlikely (that the situation in Fukushima) would lead immediately to health problems. In areas where high levels of contamination were detected, measures should be considered after holding sufficient discussions with residents based on the data that is available.”

Meanwhile, in Vienna, Yukiya Amano, the director-general of the International Atomic Energy Agency, told The Asahi Shimbun that while the situation at the Fukushima No. 1 plant was still serious, it was too early to compare it to Chernobyl.

Asked about radiation found in agricultural produce and drinking water, Amano said, “The circumstances are serious based on the standards used in Japan.”

However, touching upon analyses and predictions about radiation contamination that have related the Fukushima incident to Chernobyl, Amano said, “The studies are being conducted based on very limited data and are very extreme.”

Amano also referred to debate in other nations about their own nuclear energy policy.

“There is no change to the fact that nuclear power is a stable and clean form of energy,” he said, indicating his hope that other nations would respond in a calm manner.