**AWARDS ISSUED PRIOR TO JANUARY 20, 2025, WERE FUNDED UNDER PREVIOUS ADMINISTRATIONS AND MAY NOT REFLECT THE PRIORITIES AND POLICIES OF THE CURRENT ADMINISTRATION.** THE WORLD HEALTH ORGANIZATION (WHO) STATES THAT EXPOSURE TO RADON GAS IS THE SECOND LEADING CAUSE OF LUNG CANCER. RADON ORIGINATES FROM THE RADIOACTIVE DECAY CHAIN OF URANIUM, AND CAN BE FOUND PARTICULARLY IN REGIONS WITH SOILS DEVELOPED ON URANIUM-RICH GEOLOGICAL SUBSTRATES. RADON MEASUREMENTS TODAY LARGELY REQUIRE MANUAL METHODS OR INVOLVE COSTLY AND BULKY EQUIPMENT WHICH LIMITS BOTH THE SCALE OF MEASUREMENTS AND THE ABILITY TO GENERATE INFORMATIVE ONLINE DATASTREAMS. AT PRESENT THERE IS NO CLEAR UNDERSTANDING OF THE SPATIO-TEMPORAL DISTRIBUTION OF RADON, THE IMPACT OF SOIL AND ENVIRONMENTAL FACTORS ON RADON GENERATION AND PENETRATION, AND THE SPATIO-TEMPORAL MOVEMENT OF RADON GAS IN SOIL. THIS PROJECT DEVELOPS A REAL-TIME RADON MEASUREMENT TEST-BED WHICH WILL CONSTITUTE A 200 NODE WIRELESS SENSOR NETWORK TO BE DEPLOYED CENTERED AROUND THE NORTH-EASTERN SUBURBS OF ATLANTA IN GEORGIA, USA, A METRO AREA OF 6 MILLION RESIDENTS WITH KNOWN HIGH POTENTIAL FOR RADON EXPOSURE. THIS RESEARCHWILL BRING TOGETHER AN INTERDISCIPLINARY TEAM WITH COMPLEMENTARY EXPERTISE IN GEOSCIENCE, SOIL SCIENCE, CHEMISTRY, PHYSICS AND COMPUTER SCIENCE TO MEASURE AND STUDY SOIL RADON PENETRATION, DISTRIBUTION AND MOVEMENT IN- SITU AT HIGH TEMPORAL AND SPATIAL RESOLUTIONS. USING THE CONTINUOUS TIME SERIES MEASUREMENTS OF RADON IN SURFICIAL SOIL (WITHIN FEW FEET UNDER SURFACE) FROM 200 LOCATIONS IN THE TESTBED SITE, ALONG WITH INTENSIVE (STATIC) AND EXTENSIVE (TEMPORALLY AND/OR SPATIALLY VARIABLE) PARAMETERS, OVER LONG TERM AND AT HIGH SPATIAL RESOLUTION, THIS RESEARCH WILL DEVELOP A RADON PREDICTION MODEL THAT MAPS ITS DISTRIBUTION ALONG SPACE AND TIME.THIS PROJECTENHANCES NATIONAL RESEARCH INFRASTRUCTURE BY BUILDING A SENSOR TESTBED AND ADVANCES THE UNDERSTANDING OF THE PROCESSES AND FACTORS THAT LEAD TO RADON BUILD-UP IN SOIL AND BUILDINGS. IN ADDITION TO DISSEMINATING RESULTS THROUGH PUBLICATIONS AND PRESENTATIONS, THE TESTBED ACCESS FOR EXPERIMENTS AND ALL MEASUREMENT DATA, WILL BE MADE AVAILABLE TO THE COMMUNITY FOR ADVANCING SOIL SCIENCE AND RESEARCH. THIS PROJECT'S INTERDISCIPLINARY TEAM WILL DEVELOP A SET OF COURSE MODULES THAT WILL ENABLE CROSS-DISCIPLINARY LEARNING ACROSS COMPUTER SCIENCE, ENGINEERING, GEOSCIENCES, CHEMISTRY AND PHYSICS. THIS PROJECT WILL CREATE RESEARCH EXPERIENCES FOR UNDERGRADUATE (REU) STUDENTS AND PROVIDE OPPORTUNITIES TO CROSS-POLLINATE WITH OTHER REU EFFORTS IN THE UNIVERSITY. THIS PROJECTENABLES A BROAD PARTICIPATION OF STUDENTS AT GEORGIA STATE UNIVERSITY (GSU), THE LARGEST UNIVERSITY IN GEORGIA, WITH A LARGE POPULATION OF FIRST-GENERATION STUDENTS, AND DESIGNATED AS A MINORITY SERVING INSTITUTION (PREDOMINANTLY AFRICAN-AMERICAN AND HISPANIC SERVING INSTITUTION).