After conducting an autopsy the scientists found that the dolphins’ lungs were white – which they say is an indication of radiation poisoning.

The translated article comes from EneNews:

Apr 11, 2015 (emphasis added):

Google Translate: Ibaraki Prefecture… for a large amount of dolphin which was launched on the shore… the National Science Museum… investigated… researchers rushed from national museums and university laboratory, about 30 people were the anatomy of the 17 animals in the field. [According to Yuko Tajima] who led the investigation… “the lungs of most of the 17… was pure white ischemic state, visceral signs of overall clean and disease and infections were observed”… Lungs white state, that…