Cordless home phones, television, radio, laptops, and tablet computers all produce radiofrequency (RF) radiation, the same type of radiation that is produced by cell phones.
The radiation emitted by a cell phone can penetrate 4 - 6 cm (1.6 - 2.4 in) into an adult human brain. [1] The amount of RF absorbed into the head can be reduced by using a wired ear-piece (not a Bluetooth) rather than placing the phone against the ear.
The Director of the University of Pittsburgh Cancer Institute issued a warning [25] to faculty and staff on July 24, 2008 to decrease cell phone exposure due to a possible connection between cell phone radiation and brain tumors. His warning prompted a congressional hearing on cell phone use and tumors. [26]
The International Agency for Research on Cancer (IARC) of the World Health Organization (WHO) announced on May 31, 2011 that it had added cell phone radiation to its list of physical agents which are "possibly carcinogenic to humans" (group 2B agents). [37] Other group 2B agents include coffee, DDT, pickled vegetables, and lead.
On Oct. 20, 2011 the British Medical Journal published a study of 358,403 Danish citizens – the largest study of its kind to date – which concluded that "there was no association between tumors of the central nervous system or brain and long term (10 years +) use of mobile phones." [39]