1, cell phone radiation on the human body
Q: daily exposure to cell phone radiation, what harm will be done to the human body?
A: There is no known evidence of harm.
There are two types of radiation, ionizing radiation and non-ionizing radiation. The essence of both types of radiation are electromagnetic waves, the difference is that the frequency and wavelength are different.
Ionizing radiation is high in frequency, short in wavelength, and high in energy, and can release electrons from atoms, molecules, or other bound states to ionize matter, thus destroying DNA, killing cells, and causing damage to the body as well as the risk of cancer when it penetrates human tissue. Common ionizing radiation includes X-rays, beta-rays, gamma-rays and so on. The X-rays are used in chest radiographs and CTs that we come into contact with during medical treatment.
Non-ionizing radiation has a long wavelength, low frequency and energy, and does not lead to ionization of atoms or molecules of matter. Non-ionizing radiation is commonly found in our lives, including microwave ovens, wireless WIFI, cell phones, radar, TVs, computers, and so on. Non-ionizing radiation does not kill cells or damage DNA, but produces a thermal effect, which is the same principle as sun exposure leading to an increase in body temperature.
Q: Playing the cell phone for a long time ear burning, is the cell phone radiation burst?
A: No, most of the cell phone itself produces heat conduction, a very small part may be non-ionizing radiation caused by the thermal effect.
The absorption of electromagnetic radiation energy by the human body to the specific absorption rate (SAR value) expressed in watts / kg, of which the international standard for cell phones is 1-2 watts / kg, and people in the sun to receive an average SAR value will reach 5 watts / kg, it can be seen that the phone call is not more dangerous than the sun.
Similar principles of microwave ovens, microwaves after the power through the food in the water molecules in the rapid folding back of the movement and heat, and the heat to the food and utensils, which is also the principle of heating microwave ovens. After cutting off the power supply, the water molecules return to their normal state, and the nutrients in the food, such as carbohydrates, proteins, fats, etc., receive only the heat conducted by the water molecules, and there are no other chemical changes, and there is no such thing as "food heated by microwave ovens will produce carcinogens".
Q: Will the increased radiation from cell phones have an effect on my body?
A: Radiation enhancement is also non-ionizing radiation, which has no effect on the body.
The frequency of ionizing radiation is more than 106~1010 times of the non-ionizing radiation we are exposed to daily. So even if the cell phone radiation increases slightly when you make a phone call, it is still very far away from ionizing radiation. As an example, the amount of radiation when the phone is not used, equivalent to the cotton strips we use to knock the arm, certainly will not lead to fracture; and the amount of radiation when the phone, equivalent to the cotton strips knocked dozens of even thousands of times, although the number of times significantly more, but the same will not lead to fracture; unless replaced with a hammer hard to knock (ionizing radiation).
Research into the dangers of cell phone radiation can be traced back to the 1980s, when an American woman used a cell phone for seven months and found that she had a brain tumor that was close to the shape and location of the cell phone she was using, which she suspected was caused by cell phone radiation, and sued the cell phone maker, carrier, and retailer, and the case was eventually dismissed for "lack of reliable scientific evidence. The case was dismissed for "lack of solid scientific evidence".
In 2012, a WHO affiliate conducted a retrospective case-control study called Interphone to find out whether cellphone radiation caused cancer. The study included more than 10,000 subjects in 13 countries, including 2,765 gliomas, 2,425 meningiomas, 1,121 acoustic neuromas, 109 parotid malignancies, and 7,658 normal controls, and concluded that cell phone use did not increase the risk of these tumors.
Q: Cell phones placed next to the pillow are equivalent to at least 8-9 hours of radiation exposure to the brain, which may be dangerous, right?
A: There is a lack of research evidence to support the dangers of keeping a cell phone next to your pillow. If you are concerned about the risk of radiation, you can keep your cell phone at least 50 centimeters away from your pillow.
So far there have not been any research findings on whether sleeping with a cell phone next to your pillow poses a health risk or even a cancer risk. It's also difficult to draw accurate conclusions due to ethical considerations and limitations in research methodology.
What we can tell you, though, is that the amount of non-ionizing radiation decreases sharply as the distance between the source and the body increases. Like a cell phone, if you put it farther away, 50 centimeters or more from your head, then the amount of radiation is negligible.
Q: But the World Health Organization has said that cell phone radiation is a carcinogen, so how can you say it's not harmful?
A: The WHO speculates that cell phones may have carcinogenic potential, but there is no evidence to confirm this.
First of all, the International Agency for Research on Cancer (IARC) under the World Health Organization (WHO) has classified "radiofrequency electromagnetic waves", including cell phone radiation, as a carcinogen in category 2B, what is the concept of 2B? That is, "radiofrequency electromagnetic waves" and the occurrence of cancer may have a causal relationship, but the evidence is not sufficient. The same 2B carcinogens are also red meat (pork, beef, lamb, etc.), and cured, smoked meat level to 2A, according to which cell phone is not more dangerous than eating meat, and jerking, barbecue cancer risk is even higher than playing the cell phone.
Secondly, the fact is that even ionizing radiation (a class 1 carcinogen), which has a clear carcinogenic risk, is almost ubiquitous in the environment where we live. Even when we stay in our houses and don't go out, we are constantly exposed to cosmic radiation and radiation from building materials, and every drink of water we take, and even every breath we take, is accompanied by a tiny dose of radiation. The report of the United Nations Scientific Committee on the Effects of Atomic Radiation states that the average annual radiation dose to an individual from the above-mentioned natural background radiation is about 2.4 millisieverts, which is equivalent to the dose of radiation from a CT scan. But it is still tolerable to us humans.
The International Basic Safety Standards for Protection against Ionizing Radiation and for the Safety of Radiation Sources and China's Basic Standards for Protection against Ionizing Radiation and for the Safety of Radiation Sources (GB18871-2002) stipulate that: the limit of the annual average effective dose to the public is 1 millisieverts; the limit of the annual average effective dose to the radiation workers is 20 millisieverts, and the limit of the dose in the standards does not The dose limits in the standard do not include natural background dose and medical dose.
Our daily exposure to radiation includes radiation from the sun, radiation from decoration materials, radiation from rock and soil (also called background radiation), radiofrequency electromagnetic radiation as mentioned by WHO, and even drinking water and breathing will absorb radiation. That is to say as long as alive, these radiation is completely unavoidable.
"Radiofrequency electromagnetic waves cause cancer," so far can be said to be a kind of speculation made by WHO out of caution, but there is not yet sufficient evidence to support.
Q: How much does radiation affect the fetus when a pregnant woman uses a cell phone?
A: Cell phone radiation is non-ionizing radiation and there is no evidence of adverse effects on the fetus.
Similarly, there is no evidence to prove that non-ionizing radiation will have adverse effects on the fetus. However, it is still not recommended for pregnant women to play with cell phones for long periods of time, mainly because of the effects that the resulting prolonged fixed posture or poor rest may have on the baby.
Q: Ultrasound, chest X-ray, CT and magnetic **** vibration, which medical tests have non-ionizing radiation? Which ones have ionizing radiation?
A: Chest X-ray, CT, PET-CT and bone scan are ionizing radiation. The general dose of ionizing radiation for a chest X-ray is about 1 millisieverts, a chest X-ray is about 0.1 millisieverts, and the dose of ionizing radiation for a low-dose spiral CT screening is only 1-2 millisieverts, which is significantly lower than the dose of conventional spiral CT.
Magnetic **** vibration, ultrasound belongs to non-ionizing radiation, and its electromagnetic wave frequency is lower than that of cell phones, wireless wifi, microwave ovens and other household appliances. It is recommended that you truthfully explain to your doctor the type, time and frequency of recent tests you have done during your visit to avoid repeated exposure.
Q: Can pregnant women have medical tests with ionizing radiation?
A: Yes, but it is best to consult with your doctor first and have the tests done under your doctor's supervision.
Guidelines issued by the American College of Obstetricians and Gynecologists state that exposure of pregnant women to doses of ionizing radiation not exceeding 5 millisieverts has no known effect on the fetus.
For women who are planning to become pregnant, it is recommended that they follow the "10-day rule", i.e., undergo a medical test with ionizing radiation, such as a CT, chest X-ray, etc., within 10 days of the end of the menstrual period. The possibility of pregnancy during this period is extremely low, thus avoiding the effects of ionizing radiation on the fetus.
For pregnant women or women preparing for pregnancy who need to undergo ionizing radiation medical examinations such as chest X-ray and CT, it is important to listen to the doctor's advice and let the doctor decide whether they should undergo such examinations at this time, and whether there are any other alternatives, the corresponding radiation dosage, and the protection measures, and so on.
Stay away from harmful radiation, but also need to know these:
1. Through the regular way to buy microwave ovens, induction cookers, hair dryers, decorative materials, etc., the quality of its products and the amount of radiation are in line with national standards, will not cause damage to human health.
2. The subway, airport baggage screening instrument has a safe range of trace ionizing radiation, inside and outside the lead curtain has a blocking effect, baggage through the check to wait patiently, do not put your hand into the curtain to take the bag in advance.
3. Anti-radiation glasses, anti-radiation clothing and other common radiation protection equipment on the market can not block ionizing radiation, there is no conclusive evidence to prove the significance of protection against non-ionizing radiation, it is not appropriate to overstate the utility of such products.
4. Aviation flights have ionizing radiation, but the dose is very low and within national standards, without worrying about health risks.
5. X-ray fluoroscopy and CT machines are free of ionizing radiation when they are not in the examining state, and the scanning rooms are adequately shielded from radiation and regularly inspected, so relatives do not need to worry about exposure to ionizing radiation when accompanying the patient into the examining room or passing through the entrance to the hospital's radiology department.
2, how to reduce the impact of radiation
Currently, the popular radiation stickers on the market, a wide variety of lovely patterns, there is a lot of space to choose from, and the price is very cheap, about a few cents a piece of the cell phone stick some radiation stickers, you can reduce some of the radiation, but also play a role in the role of beautification of the phone, quite suitable for women and children. women and children to use.
Using a cell phone radiation bag
Buying a cell phone bag with the function of screen/masking cell phone signals can play a role in completely preventing radiation, but the negative impact is easy to wrongly come to the phone, affecting the normal work and study and interpersonal communication, in a word, the cell phone radiation bag is more suitable for pregnant women to use.
Use wireless Bluetooth headset
Receive and make phone calls, use wireless Bluetooth headset, reduce the head and cell phone close contact, which is also more suitable for driving and exercise in the friends.
Scientific use of cell phones
In the first few seconds before the call is connected, the radiation value reaches its peak, so please open the cell phone vibration reminder function, in the cell phone after the phone is connected, and then answer, do not put it in the ear too early, suffer a large dose of radiation damage.
Mobile phone away from important parts of the human body
Many people used to put the phone in the pants pocket, so that access is really more convenient, but the pants pocket is close to the body of the important areas of the lower abdomen, where the phone is placed, it is easy to important parts of the human body radiation, so please try to put the phone away from the human body in the handbag or briefcase.
Rejecting Shanzhai parallel-imported cell phones
Most Shanzhai cell phones are shoddy and have not gone through strict quality control, and some cell phone makers use oversized spare parts in order to improve the phone's communication capabilities, resulting in Shanzhai/Zhaizhai radiations that are much higher than those of genuine cell phones, so please say no firmly to Shanzhai cell phones.
Cool down your cell phone
In summer, when the temperature is too high, cell phones are prone to overheating, and at this time the phone is already overloaded with radiation, so it is important to stop operating the phone and place it in a ventilated area to cool it down and clear it of toxins.
Don't indulge in cell phone games
The daily use of cell phone time must be reasonable and scientific control, some friends like to play cell phone games, often forget to play to the cell phone power outage directly after charging the side of the machine, so that the radiation suffered by the radiation is also considerable, especially in the process of charging the side of the machine, but also prone to cause the problem of the battery explosion, with a considerable risk factor.
Now the cell phone is everyone's essential tool, but how to reduce cell phone radiation? In addition to the above suggestions, the most important thing is to use the phone reasonably, do not overuse.