The detector claims to can be examined - nuclear radiation- Citizens examine environmental radiation by oneself inadvisably

The detector claims to can be examined - nuclear radiation- Citizens examine environmental radiation by oneself inadvisably
The detector claims to can be examined - nuclear radiation- Citizens examine environmental radiation by oneself inadvisably
Municipal Environmental Protection Agency announces the environmental information of the radiation of capital causes citizens to the concern of radiation index in the living environment for the first time, some citizens still buy the instrument by oneself and measure electromagnetic radiation by oneself. Reporter investigation find the intersection of tester and technology at the market mark a price first and the specification was confused at present yesterday, somebody borrows " Good assistant of nuclear radiation " Distribution. The relevant speciality personage says, citizens examine the radiation behavior by oneself inadvisably. The detector claims to can be examined " Nuclear radiation " Fast-selling to radiate the tester, diamond prestige electromagnetic radiation and measure pens, original electromagnetic radiation tester of Taiwan Washing the treasure network to import " Radiation " Two words, various advertising languages blow against one's face. Japan, behind the earthquake, " nuclear radiation " at the radiation detector that nobody shows any interest in on ordinary days take Windward driving,have a large circulation turn on. Only take electromagnetic radiation tester as examples, this kind of instrument price varies from eight or nine yuan to more than one hundred yuan, as many as ten thousand yuan, 36000 yuan of marked price claimed to import from Germany for one section. Sold 182 unexpectedly in one month with and a home tester at 198 yuan, another sincere electromagnetic radiation detector from Hong Kong was called " good assistant of nuclear radiation " . And according to the introduction of expert, electromagnetic radiation is made up by electric energy and magnetic energy transferred together by the space, have nothing to do with nuclear radiation. Observe finding, various technical indicators of these products are not the same carefully. Some instrument measure width 50 hertz to 3000 hertz now frequently, the width is 50 hertz to 5000 hertz now frequently too, some producers have stipulated low frequency and high frequency by oneself, low frequency is 5 hertz to 400,000 hertz, high frequency gets 2000 MHZ now now for 30 MHZ. Moreover, instrumental errors are also different, some are 3%, some are 5%. And the professional personage points out, the ones that should choose the tester according to frequency of the radiant are wide frequently. And to the differentiation of low frequency and high frequency, the division of the producer is not scientific either. Generally speaking, ultralow frequency has different limit, more one that used is 50 hertzs or 100 hertzs. High frequency is 100,000 hertz to 30 hertz now, 30 trillion is the ultra-high frequency to 300 trillion, 300 trillion is the microwave frequency to 300,000 trillion. It is examined that 1500 yuan of professional organization arises At present, the unit that Beijing Municipal Environmental Protection Agency does not have subsidiary foreign test electromagnetic radiation, an active one is generally third party's check organization on the market. "Mainly examine ' the room ' to examine ' stands '. " The staff members of a check organization tell reporters, the data that they examined are mostly used for going to court and using, there is electric magnetic field of high-voltage line examined near the Residential Area, there are ones that examine computer lab and apparatus, still live in the transformer substation or mobile phone the residents that is with nearby base station demand to test that radiates the environment. They will generally measure intensity of electric field or magnetic field, power density according to location and requirement that the customer live in, and provide a report. This staff member tells reporters too, because the data that individual tests have not measured and authorized by CMA country, not having legal effect, residents must ask the specialized company to examine while going to court. Because is the professional test, the initial prices of these organizations are not low. The Beijing room staff members of technique center of pollution detection of internal environment reveal, they test generally 3 point ones are examined, 500 yuan for a point, are 1500 at more least yuan once. The test center likewise gets up at 1500 yuan for 3 points and examines on the table day of another check organization. Staff members return " Take care of " Reporter: "If individual examines, we can be a bit more favourable. If the developer or property trusts, leave to the common price, should be a bit more expensive naturally. " It is reported, this organization does a environmental evaluation for the Residential Area, the average price is from 30,000 yuan to 40,000 yuan. There are national standards to examining the electromagnetic radiation behavior by oneself in the electromagnetic radiation environment, the professional personage points out this kind of method is inadvisable. A person of gold of the internal environment pollution detection technique center of Beijing room is told reporters by the engineer, the checkout equipment must get China National Measuring Science Research Inst to assay first after buying, later will use, will take in the course away assaying according to fixed cycle too to use, in order to guarantee the sensitivity of the instrument. Citizens individuals buy the instrument to measure, it is unable to guarantee on accurate degree. Then, what kind of radiation environment is normal? Environmental protection portion " electromagnetic radiation protect regulation " that issue point out, get 3000 now in the this most sensitive ranges of the public now in 30, the standard limit of the power density of the electric magnetic field is each square meter for 0.4 watts, it is safer to be lower than this number value. Engineering the electric field, magnetic field intensity limit frequently on selecting switchyard to set up in vltrahigh voltage, our country recommends 0.1 fine long hair Tesla as the evaluation criterion of the intensity of magnetic induction. Teacher Cheng of the metal working still proposes, various electromagnetic radiation testers on the market are very different, the apparatus which different producers produce, performance differs significantly. And electromagnetic radiation receives the environmental influence factor very big, even if the error is greater and difficulter to discern, the data examined out have no convincingness. If really need in this respect, advise citizens to invite the professional organization with qualification to test. (reporter Ren Min)


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