From the article:
The operator of the Fukushima Daiichi nuclear plant says 100 tons of water containing record high levels of radioactive substances overflowed from a storage tank.
Also:
... the leaked water contained... ...230-million becquerels per liter of beta-ray emitting substances, consisting mainly of strontium 90.
The level is about 7.6 million times the government's permissible standard for the nuclide level of water allowed to be released into the sea.
...they also detected 9,300 becquerels per liter of cesium 137 in the water.
Is "100 metric tons" of contaminated water "less favorable" to Tepco than "26,407 gallons" of contaminated water?
Checking Tepco's website, it turns out that "100 tons" is straight from their press release:
http://www.tepco.co.jp/en/press/corp-com/release/2014/1234394_5892.html