Abstract

The spectral energy of a light transmitted through the cheek was tested photographically in the region of λ0.86µ, and also by a spectrometer throughout the whole spectrum. A very sensitive vacuum thermocouple was used. The photographs of the spectrum showed 14% transmission of λ0.86µ through the cheek. The cheek transmitted a maximum of 20% at λ1.15µ and the water in the body cut off the longer wave lengths. The spectral energy transmitted by bacon fat was found to be similar to that of the cheek; however, it transmitted nearly five times as much energy. The ordinary incandescent electric light with filters to cut out the visible and infrared beyond λ1.4µ is ideal for deep penetration of light into the body.

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References

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  1. Archives of Physical Therapy, X-ray & Radium, 10, No. 3.
  2. Edison Pettit, Astrophysical Journal, 66, 1927.
  3. Dr. Sonne, Archives of Physical Therapy, X-ray & Radium, March 1929.
  4. Henry Laurens, Physiological Reviews, 8, No. 1, 1928.

Laurens, Henry

Henry Laurens, Physiological Reviews, 8, No. 1, 1928.

Pettit, Edison

Edison Pettit, Astrophysical Journal, 66, 1927.

Other

Archives of Physical Therapy, X-ray & Radium, 10, No. 3.

Edison Pettit, Astrophysical Journal, 66, 1927.

Dr. Sonne, Archives of Physical Therapy, X-ray & Radium, March 1929.

Henry Laurens, Physiological Reviews, 8, No. 1, 1928.

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