Radiation poisoning
From Tardis Wiki, the free Doctor Who reference
Radiation sickness was an illness caused by excess radiation. When the First Doctor, Susan Foreman and Ian Chesterton discovered, through the use of a Geiger counter, that there was excess radiation on Skaro, they deduced that it was causing radiation sickness. In that particular case, the effects of the disease included a jungle being turned to stone, soil becoming barren, and a feeling of sickness between the three. (TV: "The Survivors")