How much intake will reach 10mSv?

This is an approximate level of intake that can cause 10mSv exposure to the human body. The intake would be differ in the foods and drinks, so I cannot guarantee that the intake will kill the test subject. 10mSv is the line to suggest people to stay indoors.

Cesium 770,000Bq/kg = 10mSv.
Iodine 450,000Bq/kg = 10mSv.

5000mSv can kill 50% of people and make them permanently sterilized.
Cesium 38,500,000Bq/kg = 500mSv.
Iodine 22,500,000Bq/kg = 500mSv.

The radioactive contamination from Fukushima contains multiple radioactive materials, so a good combo can increase the fatality.

10,000mSv can kill more than 90% of the people.
Cesium 770,000,000Bq/kg = 1,000mSv.
Iodine 450,000,000Bq/kg = 1,000mSv.

These children in Fukushima got Geiger Counter badges, aren't they? I am sure that the mad scientists are enjoying the human experiment like the time after Hiroshima and Nagasaki. Same ethnic groups and more exciting researches they can work on.

And you can count the death rate from these information how far the average Japanese would live. They might eat the foods with the contamination of 500Bq/kg and 300Bq/L. Ah, here is a good news. You can see, the infants in Tokyo are drinking the contamination twice or three times as the regulation.

N-H-K has just reported that radioactivity readings in the water at Tokyo’s Katsushika purification plant now exceed the legal safety limits for infants.
Yesterday, the reading for radioactive iodine 131 was 210 becquerels per liter. Today it was 190 bq/l.
The legal limit for infants is 100 bq/l. For adults and other children, the legal limit is 300 bq/l.
(http://www.japanprobe.com/2011/03/23/tokyo-water-now-with-200-bql-of-radioactive-iodine/)

Some foods like mushrooms have more than 10,000Bq/kg effects. So, trying something like those will help the fatal rate. I assume the water intake would be quite easy for reaching the limit.