What can i do to protect myself from the radiations that emit from tv's, computers and mobile phones ?

Avoidance: Keep far away from the source. There has been little proof that the amount of radiation from TV and computer poses a health risk. As for mobile phone, the issue remains unsettled re. brain tumor suggested. If concerned, use your mobile device only when necessary or launch Bluetooth(If a phone is glued to your ear much of the day, your brain is already 1/2 dead anyway).