The examined ultraviolet dosimeter papers in unexposed form are white, increasing ultraviolet exposition makes them yellow, yellowish brown and dark brown. The dose is determined visually, by comparison with a standard color scale. They are developed and fabricated for simple disposable chemical UVB dosimeters, for prevention of UV erythema. There were analized two different kinds of dosimeter papers. The base emulsion layer of the first variant dosimeter paper is on a silver-mercury(I)-oxalate base, while that of the second variant dosimeter is on a silver-ferro-oxalate base.
Reflection characteristic curves of the dosimeter papers at sunshine and at 300 nm irradiation were determined, spectral reflection, colorimetric and relative spectral response measurements were performed, fading of the paper and relative responsivities (Z) (as recommended by CIE) were determined.
Irradiation times at sunshine were between 1 and 80 minutes, sunshine produced exposures on the dosimeter papers were characterized with the CIE recommended erythema exposure.
For spectral response determination at first the reflection characteristic curve of the dosimeter paper was determined at 300 nm. The relative responsivities in the 230 nm to 420 nm wavelength range were characterized by the reciprocal ratio of the exposure at a given wavelength, relative to the equivalent exposure at 300 nm. This equivalent exposure products the same density as that of the given wavelength.
Optical arrangements used for irradiations and for reflectance and colorimetric measurements are demonstrated as well.
* Now guest researcher at NIST Optical Technology Division