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The Naval Surface Warfare Center has materials exposed for outdoor weathering and exposure at three sites: Philadelphia, PA; Miami, FL; and Wittman, AZ. The Miami, FL and Wittman, AZ test sites are run by Atlas Weathering Service and are instrumented to measure UV-A plus UV-B solar radiation using the Eppley TUVR. Since there is no Eppley TUVR at Philadelphia, PA, an estimate is made of the radiation a TUVR would measure at that site. This estimate is based on establishing the relationship between the accumulated exposure measured by a TUVR at Miami, FL and the 368 nm channel of a USDA UV radiometer located 65 km distance at Everglades National Park, FL. The ratio of accumulated exposures of the USDA 368 nm channel and the TUVR is constant to within 5% over the 7 week, 13 week, 25 week, 49 week and 97 week periods. A second USDA UV radiometer located at Beltsville, MD was in operation during these periods about 185 km from the NAVY test site in Philadelphia, PA. Using the accumulated exposures of the USDA 368 nm channel at Beltsville, MD along with the ratios of the USDA 368 nm channel and the Atlas TUVR developed from the FL data, an estimate is made of the radiation a TUVR in Philadelphia, PA, would measure over the 5 test periods. Sources of error are discussed and recommendations made.