If your employees are glowing -- and not with joy -- Landauer can tell you why. Through its subsidiaries, Landauer manufactures and markets dosimeters (radiation detection monitors) used in nuclear plants, hospitals, and university and government laboratories. Landauer's services include distribution and collection of radiation monitors and exposure reporting. Its HomeBuyer's Preferred subsidiary provides residential radon monitoring services. Landauer also offers medical physics services to hospitals and radiation therapy centers through its GPS subsidiary.