How much electromagnetic radiation is harmful to the human body? 浏览次数：1593 次悬赏分：50 | 解决时间：2008-1-14 15:36 | 問者：xiaoyao0521 在强电的工作环境下，知道电压和电流，怎么计算辐射的大小？ There is no formula? (do not need computers, TVs and other household appliances to explain) Best Answer This is difficult to calculate, only through the environment to estimate the national standard security of long-term exposure to electromagnetic waves average power density can not be greater than 4mw / cubic centimeters. Industrial frequency strong electricity in general the energy of electromagnetic radiation is not large, but in some line conditions and the environment, times the frequency radiation may be enhanced, strong magnetic field on the harm of people can not be ignored. There are some devices may be stronger magnetic field, these are difficult to calculate, only rely on some equipment to measure. How much intensity of radio radiation is harmful to human body? 浏览次数：168 次悬赏分：0 | 問問时间：2011-5-21 15:01 | 問者：夏熙敬 Other Answers ***1 Article 200mW or less, basically no harm to people. More than this standard will have a more adverse effect on health. Electromagnetic radiation is easy to exceed the standard: 1. computer 0.6-1.5 meters away; 2. living room in the television, stereo and other home appliances are concentrated; 3. industrial, scientific and technological, medical and electrical equipment around; 4. broadcasting and television transmission towers around; 5. a variety of microwave towers around; 6. around the radar; 7. high-voltage power transmission lines and equipment around. In addition, the cell phone is more harmful to people. Chase the harm of electromagnetic radiation on the human body is related to the frequency and intensity of the two variables, the higher the frequency, may cause harm to the human body, the lower the intensity of radiation, the different frequencies do not have to use the radiation intensity standard, so 200mW the following data does not indicate what the problem is. For example, the field strength of the national standard industrial frequency high voltage is actually 4000 volts/meter, while the TV field strength of 1 millivolt/meter is very strong. Does anyone know of an international standard related to this? How is the intensity of radiation measured and what is the scale? At what level does it pose a threat to the human body? 浏览次数：3260 次悬赏分：0 | 解决时间：2009-8-16 07:43 | 問者：yffim 最佳答案 Including the calculation of the energy absorbed by the medium in the radiation field and the extrapolation of the radiation hazards posed to human health in two aspects. Absorbed dose A measure of the amount of radiation energy absorbed by a medium in a radiation field, expressed in terms of D. D = d 劔/dm, where d 劔 is the average energy of ionizing radiation conferred on a volume of material in the element, and dm is the mass of the material in the volume of the element. It is the international system (SI) unit is Gray (Gy), 1Gy = 1J/kg, temporarily and with the unit is the rad (rad), 1rad = 10-2Gy. Dose equivalent The radiation harm to the human body, not only with the absorbed dose, but also with the quality of the radiation, as well as other factors. In order to measure the effects of different qualities of radiation on the human body on the same scale, radiation protection introduced the dose equivalent H, which is defined as H = DQN, Q is used to characterize the quality of radiation quality factor, N is the product of other correction factors, the current International Commission on Radiological Protection designation N = 1. Dose equivalent of the international system of units for the Xi [Watts] (Sv), 1Sv = 1J / kg, temporarily and with units of rem (rem). The unit is rem (rem), 1rem = 10-2/Sv. Q value is the collision in the water at the point of interest to stop the collar (L∞) function of the International Commission on Radiation Units and Measurements Q and L∞ relationship shown in the table. The ratio of the maximum dose equivalent to the absorbed dose at the depth where the maximum dose equivalent is located is called the effective quality factor and is denoted as her. Radiation damage to the human body is directly related to the incidence of stochastic effects, and the incidence of stochastic effects is often assumed to be linear with absorbed dose when evaluating absorbed dose damage to the human body. Many sources indicate that the relationship between the incidence of stochastic effects E and D for doses below a few Gray can be expressed as E = aD + bD2, where a and b are constants. The contribution to E is dominated by bD2 at high doses (above 1 Gy) and high dose rates (above 1 Gy/min), and by aD at low doses. Therefore, the dose equivalent cannot be used to evaluate the harmful effects on the human body caused by accidental high-absorbed-dose exposures. Collective dose equivalent The sum of the dose equivalents received by all members of a group as a result of a particular practice or source of radiation. It is used to evaluate the hazards to which the group is exposed. Expressed in Sk, defined as. where p(H) is the differential distribution function by dose equivalent H in the group. Dose equivalent burden in some cases, the group of long-term exposure to a source of radiation, such as nuclear explosions fallout or radioactive waste discharged from nuclear plants, the dose equivalent burden is used to evaluate the future exposure hazards caused by this situation, expressed as He. A special case of the dose equivalent burden is the cumulative dose equivalent to an organ or tissue from a single intake of radioactive material into the human body over a period of 50 years after which the intake of radioactive material ceases.
I hope this solves your problem.