Table 4Representative terrain reflectance factors for horizontal surfaces measured with a UVB radiometer at 12:00 h (290–315 nm) in the USA

MaterialReflectance
(%)
Lawn grass, summer, Maryland, California and Utah2.0–3.7
Lawn grass, winter, Maryland3.0–5.0
Wild grasslands, Vail Mountain, Colorado0.8–1.6
Lawn grass, Vail, Colorado1.0–1.6
Flower garden, pansies1.6
Soil, clay/humus4.0–6.0
Sidewalk, light concrete10–12
Sidewalk, aged concrete7.0–8.2
Asphalt roadway, freshly laid (black)4.1–5.0
Asphalt roadway, two years old (grey)5.0–8.9
House paint, white, metal oxide22
Boat dock, weathered wood6.4
Aluminium, dull, weathered13
Boat deck, wood, urethane coating6.6
Boat deck, white fibreglass9.1
Boat canvas, weathered, plasticized6.1
Chesapeake Bay, Maryland, open water3.3
Chesapeake Bay, Maryland, specular component of reflection
   at Z = 45 °N
13
Atlantic Ocean, New Jersey coastline8.0
Sea surf, white foam25–30
Atlantic beach sand, wet, barely submerged7.1
Atlantic beach sand, dry, light15–18
Snow, fresh88
Snow, two days old50

From: 1, Exposure Data

Cover of Solar and Ultraviolet Radiation
Solar and Ultraviolet Radiation.
Iarc Monographs on the Evaluation of Carcinogenic Risks to Humans, No. 55.
IARC Working Group on the Evaluation of Carcinogenic Risks to Humans.
©International Agency for Research on Cancer, 1992.

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