Microwave radiation usually refers to electromagnetic waves with a frequency of 300 to 300,000 MHz and a wavelength of less than 1 m. Any object radiates infrared rays while radiating microwaves.
Types of
Daily dose
(W · h / cm2)
8h
The characteristics of microwave radiation are as follows:
(1) Microwave is opposite to infrared, which is an important radiation characteristic of an object under low temperature conditions. The lower the temperature, the stronger the microwave radiation.
(2) Intensity ratio of microwave radiation
Microwave is a kind of electromagnetic wave. It is generated by the periodic change of the electric and magnetic energy in the electromagnetic oscillation circuit like the high-frequency electromagnetic wave. Microwave radiation usually refers to the electromagnetic wave with a frequency of 300 ~ 300,000MHz and a wavelength of less than 1m. Microwave can be divided into decimeter wave, centimeter wave and millimeter wave according to its wavelength. At present, almost all electrodeless ultraviolet lamps on the market are microwave-excited, and working under microwave conditions for a long time will cause great harm to the human body. [2]
Microwave radiation is a source of physical pollution and it is not easily detectable by people. Regarding the harm of microwave to human body, it has been found abroad as early as the 1930s, but the systematic research on occupational hazards began in the 1950s. At present, the harm of microwave to the human body has become the occupational hygiene and environmental medicine. A basic study.
The harm of microwave radiation to the human body mainly refers to the effects of low-intensity chronic radiation, and the acute effects of high-intensity can also harm the human body, but it rarely occurs. It manifests itself in the following aspects:
1. Impact on the nervous system
The nervous system has high sensitivity to microwaves. After repeated exposure to low-intensity electromagnetic radiation, the human body will cause changes in the function of the central nervous system and symptoms such as neurasthenia. The main manifestations are dizziness, drowsiness, weakness, and fatigue. Memory loss and
In order to prevent microwave radiation and protect the health of microwave workers, the Ministry of Health approved the "Sanitary Standard for Microwave Radiation in Workplaces" in February 1989 and implemented it in October of the same year. This standard is applicable to all types of operations exposed to microwave radiation. . As the technical standards of the power industry, "Technical Code for Design of Microwave Communication in Power Systems" and "Code for Design of Labor Safety and Industrial Hygiene in Thermal Power Plants" have also successively formulated the limit values of tireless standards. Health, reducing the harm caused by microwave radiation, played a great preventive role.
According to China's health standards and the physical characteristics and operating characteristics of microwaves, the principles of their safety protection are mainly to take effective protective measures against leakage sources and radiation sources and the environment in which operators operate their jobs. The safety protection measures for leak sources and radiation sources are to adopt perfect shielding and absorption facilities for microwave equipment. Its characteristic is to minimize the leakage energy of its equipment in order to minimize the power density leaked into space. The safety protection measures for the environment in which the operator operates the post, that is, shielding and using personal protective equipment at the work site. Its characteristic is to increase the attenuation of electromagnetic waves in the propagation medium as much as possible in order to reduce the power density incident to the human body below the hygienic standard value of microwave irradiation. [2]
