Questão 24
UFU 2018
(UFU - 2018 - 1a FASE)
New Studies Link Cell Phone Radiation with Cancer
Researchers call for greater caution, but skeptics say the
evidence from rat studies is not convincing
By Charles Schmidt
Does cell phone radiation cause cancer? New studies show a correlation in lab rats, but the evidence may not resolve ongoing debates over causality or whether any effects arise in people.
The ionizing radiation given off by sources such as x-ray machines and the sun boosts cancer risk by shredding molecules in the body. But the nonionizing radio-frequency (RF) radiation that cell phones and other wireless devices emit has just one known biological effect: an ability to heat tissue by exciting its molecules. Still, evidence advanced by the studies shows prolonged exposure to even very low levels of RF radiation, perhaps by mechanisms other than heating that remain unknown, makes rats uniquely prone to a rare tumor called a schwannoma, which affects a type of neuron (or nerve cell) called a Schwann cell.
Disponı́vel em: <https://www.scientificamerican.com>. Acesso em: 29 mar. 2018.
Com base no texto, afirma-se que
o celular provoca um tipo de tumor em seres humanos.
a radiação RF não causa efeitos biológicos.
o estudo comprova o perigo causado pelo celular em humanos.
a exposição à radiação ionizante afeta moléculas do corpo.
Gabarito:
a exposição à radiação ionizante afeta moléculas do corpo.