Imaging of ultraweak spontaneous photon emission from human body displaying diurnal rhythm

PLoS One. 2009 Jul 16;4(7):e6256. doi: 10.1371/journal.pone.0006256.


The human body literally glimmers. The intensity of the light emitted by the body is 1000 times lower than the sensitivity of our naked eyes. Ultraweak photon emission is known as the energy released as light through the changes in energy metabolism. We successfully imaged the diurnal change of this ultraweak photon emission with an improved highly sensitive imaging system using cryogenic charge-coupled device (CCD) camera. We found that the human body directly and rhythmically emits light. The diurnal changes in photon emission might be linked to changes in energy metabolism.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Circadian Rhythm*
  • Energy Metabolism
  • Humans
  • Photons*