The eye sees alpha particles

Incredibly, the human eye sees alpha particles. This assumption was expressed already in 1952 by the professor of the University of California J. Tobias - after adaptation in the dark, the human eye can see the passing charged particles. The verification of this idea on people working with nuclear accelerators did not give a positive result. But, after flying to Moon, this assumption was remembered again. Discovered by a member of the crew of "Apollo 11" E. Aldrin, the effect of the appearance of light flashes in the darkness was so unexpected for him that at first he did not even dare to tell about this phenomenon to his comrades. However, on the way back from the Moon to Earth it's still asked them to check his observations. And what? After the flight, I. Armstrong and M. Collins unanimously declared that they also observed in the total darkness some bright points and dashes in front of their eyes.

Incredibly, the human eye sees alpha particles

Alpha particles arise in the alpha decay of nuclei, in nuclear reactions and as a result of complete ionization of helium-4 atoms. For example, as a result of the interaction of the nucleus of lithium-6 with a deuteron, two alpha particles can be formed: 6Li+2H = 4He+4He. Alpha particles form an essential part of the primary cosmic rays; most of them are accelerated helium nuclei from stellar atmospheres and interstellar gas. Alpha-particles of high energies can be obtained with the help of accelerators of charged particles. Danger to humans under external irradiation can be alpha particles with energies of 10 MeV and higher, sufficient to overcome the dead skin of the stratum corneum. Therefore, most research accelerators operate at energies below 3 MeV. The alpha particles, arising at alpha-disintegration of the radionuclides which have got inside of an organism represent the big danger to the person. Enough microscopic amount of radioactive material to cause the patient acute radiation sickness, often with a fatal outcome.

Special experiments, put by English and American researchers, have established that the human eye sees not only ordinary light, but also alpha particles, nitrogen ions, and in some cases cosmic rays.