tailieunhanh - ENCYCLOPEDIA OF ENVIRONMENTAL SCIENCE AND ENGINEERING - RADON

Sau khi phát hiện ra mức độ rất cao của radon trong nhà liên quan đến ngôi nhà ở đông bắc Pennsylvania vào tháng Mười Hai năm 1984, Cục Bảo vệ Môi trường New Jersey đã được chỉ định là cơ quan nhà nước dẫn đến địa chỉ tiềm năng cho các vấn đề radon ở New Jersey. Cục được giao nhiệm vụ mô tả các vấn đề vì nó có thể tồn tại ở New Jersey và phát triển một phản ứng của nhà nước phối hợp cho vấn đề. Do các ảnh hưởng sức khỏe nghiêm trọng công. | RADON Following the discovery of very high levels of indoor radon associated with homes in northeastern Pennsylvania in December of 1984 the New Jersey Department of Environmental Protection was designated as the lead state agency to address the potential for radon problems in New Jersey. The Department was charged with characterizing the problem as it might exist in New Jersey and developing a coordinated state response to the problem. Due to the potentially serious public health implications of exposure to high levels of radon the characterization of New Jersey s radon problem proceeded simultaneously with the development of a program to educate the public regarding radon and respond to residents needs for reliable radon testing and radon remediation services. The current data indicates that New Jersey s indoor radon levels are among the highest known and that as many as 1. 6 million homes in New Jersey may be at risk for radon problems. Approximately one-third of homes studied thus far test at or above the 4 picocuries per liter guidance level recommended by the United States Environmental Protection Agency as a feasible goal for remediation of high concentrations of indoor radon. New Jersey s response to this problem is characterized by an integrated multi-agency approach and the growth of firms providing reliable regulated radon testing and remediation services in the private sector. BACKGROUND Radon-222 is the single gaseous isotope among the fourteen principal decay products composing the 4n 2 natural decay series beginning with uranium-238 and terminating in lead-206. The principal decay products of this series their half lives and principal associated emissions are given in Table The atmospheric concentration of radon varies with location but is typically on the order of picocuries per liter pCi 1 over land The average radon concentration indoors in the United States in not well known but has been estimated3 to be in the range of 1 to