JMA carries out both spectral and broadband observations of UV-B radiation. In spectral observation, dispersed ultraviolet radiation through a diffraction grating is measured spectrally using a photomultiplier tube at 0.5 nm intervals within the wavelength of 290-325 nm every hour from sunrise to sunset using a Brewer spectrophotometer. In the broadband UV-B observation, the total amount of global UV-B radiation is measured using a broadband UV-B radiometer.
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