In order to estimate the public suffered personal dose equivalent, should be selected according to the likely population affected by the appropriate critical group, and selection of appropriate parameters and mathematical models, radiation protection materials wholesale, estimated that the average effective dose equivalent of this group, this dose evaluated. Human activities sometimes cause natural ionizing radiation exposure to the public level change, stainless steel radiation protective doors, thus limiting the additional irradiation caused increase is necessary, radiation protection CT room door, should be based on the different types and sources the dose distribution to determine the level of specific investigations, radiation protection, management limits and intervention levels. 1.6 All practices and facilities associated with radiation exposure, should be in line with the practice of the legitimacy and the ALARA principle and ensure that irradiated individuals suffered lower than the corresponding dose limits. 1.7 units engaged in radiation work should be set independently of the production run department of radiation protection and environmental protection agencies (or, part-time staff). These institutions should accept the supervision and guidance of authorities and provinces where radiation protection and environmental protection sectors. Hospital radiation protective lead doors, Hebei Ericsson (certified), radiation protection provided by the Hebei Medical Engineering Co., Ericsson. Ericsson Hebei Medical Engineering Co., Ltd. (www.hslixin.com) Hebei Hengshui, a leader in medical device manufacturing equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Hebei Ericsson leadership with the staff warmly welcome all inquiries negotiations to create a better future Hebei Ericsson.