Dar un lucru este sigur: razele care vin dinspre mobil pătrund în corp şi produc, printre altele, căldură care se măsoară în valoare SAR (rata specifică de absorbţie). SAR reprezintă puterea absorbită pe unitatea de masă de ţesut.
Dacă valoarea SAR este ridicată, utilizarea mobilului devine nesănătoasă, deoarece prea multă căldură ajunsă la cap creşte riscul de îmbolnăvire. Dacă stai să te gândeşti este singura sursă de câmp electromagnetic pe care o ţii la cap intenţionat.
Se ştie că s-a stabilit prin lege comercializarea doar a acelor telefoane mobile a căror valoare SAR nu depăşeşte valoarea limită de 2W/kg. În acest fel sunt eliminate riscurile unor deteriorări ale ţesuturilor din cauza efectelor termice.
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