Lena Pu has been a wireless radiation researcher for six years.  Here is some astonishing information: 

The images below show a schoolteacher's blood before and after a day in the classroom.  The red blood cells in the first image are spaced apart, which means they have a negative charge on the surface (zeta potential) and are repelling each other, ensuring good blood flow.  In the second image, the cells have burst, looking smashed and clumped together. The red you see is the oxygenated hemoglobin spilling out (notice that the cells are intact in the first image).  Destruction of RBCs creates an anemic condition known as hypoxia (low oxygen), inducing fatigue at the very least.