Fukushima radiation monitor spikes twice after M5.2 quake near plant (CHART)
Published: June 28th, 2012 at 3:16 pm ET
Fukushima Prefecture Radioactivity Information
June 28, 2012
h/t Fukushima Diary
Also from today: Intense M5.2 quake hits Fukushima -- Centered just miles from plant (MAP)
The quake occurred on June 28 at 14:52 JST and the spike began around 17:00 JST.
The charts measure radiation dose in micrograys per hour, equivalent to microsieverts per hour (Source)