Midsummer solar UV-radiation in Finland compared with the UV-radiation from phototherapeutic devices measured by different techniques.

Type:Uv phototherapy Time:2017-12-14 9:40:57

Midsummer solar UV-radiation in Finland compared with the UV-radiation from phototherapeutic devices measured by

different techniques.

Midsummer solar UV-radiation in southern Finland was measured by a spectroradiometer, polysulphone film dosimeters,

and a solid-state UV-meter. Solar UV-irradiance was compared with radiation from different phototherapy devices

(UVB, SUP, and PUVA therapy equipment). Measured by the spectroradiometer, the solar UVB irradiance at noon was 55

microW/cm2; it varied from 60 to 79 microW/cm2 according to the doses received by the film dosimeters on clear,

sunny days in June. A solid-state detector gave a markedly overestimated UVB irradiance of 235 microW/cm2. Solar

UVB radiation would lead to 1.5 MEDs in 2 hours around midday, 2.9 MEDs in 4 h and 8 MEDs in 12 h in midsummer at

latitudes in southern Finland. Solar UVB radiation corresponds to that emitted from PUVA treatment devices, but the

UVA (315-400 nm) radiation of the latter is about 3-fold that of solar radiation. The UVA radiation from SUP and

PUVA treatment devices resembled each other but the former emitted more radiation at the lower wavelengths of 315-

340 nm. The UVB irradiance of the UVB therapeutic device was 25-55 times the irradiance of the sun.

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