Appropriate radiometric quantities in laser dosimetry

David H. Sliney

doi:10.1117/12.350031

14 June 1999 Appropriate radiometric quantities in laser dosimetry

David H. Sliney

Proceedings Volume 3601, Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical; (1999) https://doi.org/10.1117/12.350031
Event: BiOS '99 International Biomedical Optics Symposium, 1999, San Jose, CA, United States

Abstract

Unlike radiofrequency and ionizing radiation which can penetrate deeply into biological tissues, optical radiation is generally absorbed very superficially. Except for the relatively narrow band of visible and near-infrared (IR-A) radiation from approximately 400 - 1400 nm, skin and other biological tissues are nearly opaque to optical radiation. For this reason, the volumetric or mass-based concepts of absorbed dose (i.e., J/cm³ or J/gm) used in other areas of radiation biology are of little value. Additionally, the absorbed radiant energy is conducted out of the absorbing site and for this reason thermal effects depend largely upon the size and location of the absorbing site as well as exposure and exposure rate. Concepts of surface exposure dose are therefore most useful and practical. The concepts of fluence and fluence rate are shown to be useful for volume scattering in the visible spectral region where photochemical reactions are to be described.

Citation Download Citation

David H. Sliney "Appropriate radiometric quantities in laser dosimetry", Proc. SPIE 3601, Laser-Tissue Interaction X: Photochemical, Photothermal, and Photomechanical, (14 June 1999); https://doi.org/10.1117/12.350031

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