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Date: 2013 - 11 - 29
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Popular science writers rumored secret: Is security inspection harmful to the human body?

Date: 2019-05-09
Views: 69

Some time ago, when a woman took the subway, she refused the security check and pushed the security guard down the stairs to faint. The woman was detained for 10 days. There are many people who reject security checks in reality, but there is no such thing as an extreme woman. One of the reasons why everyone rejects is that they don't understand the principle of security instruments, and they have concerns in their hearts. Today, let's talk about some common and current* security devices.


Security X-ray machine, also known as security inspection machine or baggage security inspection machine. Everyone is familiar with it. It is the main baggage screening equipment for subways and airports. The principle is simple, the ability to use X-rays to penetrate substances. Density is different, thickness is different, composition is different, and x-ray penetration ability is also different. X-ray machines are based on the ability to penetrate various substances to identify objects in the baggage.


Display image of various luggage under X-ray machine


The X-ray machine not only recognizes the shape of the object, but also displays the color. The color of each substance is different. Like organic materials, such as paper, clothing, and a variety of foods, usually orange. Mixed materials and light metals, such as those containing sodium, silicon, and aluminum, are usually shown in green. Iron, copper, silver, etc. are shown in black and blue. The degree of lightness and darkness of the above various colors depends on the density and thickness of the material.


Many people are worried that the food inside their bags will be so cleaned from the baggage screening machine that the food will be contaminated by X-rays. There is no need to worry too much about this. The X-rays emitted by the baggage screening machine have a small power and are detected once. The received radiation dose is less than 5 micro-Swarth, which is far lower than those used for radiation sterilization of food. dose. Many of the foods we eat are actually irradiated. Other countries, such as the US Food and Drug Administration and the US Department of Agriculture, can sterilize and preserve the following foods, such as frozen or frozen red meat. Poultry, fresh fruits and vegetables, and grains.


Security gate


The security gate, also known as the metal detector door. Mainly to detect the metal weapon carried on the passenger. The principle is also very simple, that is, the principle of electromagnetic induction is utilized. Rapidly changing magnetic fields are generated on both sides of the security door. These magnetic fields do not affect the human body, except for metals, because the metal generates eddy currents under rapidly changing magnetic fields, and the eddy currents generate a magnetic field. When the security gate detects this When a new magnetic field is applied, the security door will automatically sound or flash.


The security door will flash after detecting the metal on the body.


When many people pass the security checkpoint, they often have resistance and think that it will be harmful to the body, especially pregnant women* who are worried about this. It is normal for pregnant women to care for the fetus in the body. However, the safety door is not an X-ray machine. It only produces electromagnetic fields and does not produce ionizing radiation. This electromagnetic field is very weak, only about 1 micro-Tesla. This data is tens of times different from the 30 micro Tesla specified in the National General Specification for Pass-Through Metal Detectors. In addition, we can also think so, security personnel are in the security door for many years, if the security door is harmful to the human body, I believe they will not agree.


Terahertz human body security instrument


Many people have this kind of experience. Every time they fly, they have to be touched by the security personnel up and down. The passengers are unhappy. In fact, the security personnel are not good. I don't believe you will try to find thousands of people in one day.


Also, regular security checks, no matter how publicized, there will be passengers worried about radiation problems. * After the conventional security equipment is slower, it wastes a lot of manpower and resources.


Therefore, we urgently need a security instrument that does not require body search and does not emit X-rays or electromagnetic waves - this is the terahertz human body security instrument.


Before we talk about this kind of instrument, let's first understand what is 'terahertz'.


The 'THz' in the middle position is 'Tertz'


'Tai' is an order of magnitude unit, which is the same as the 'thousands', 'mega', 'ji' and so on that we usually hear. Your mobile phone has 16G space, where G is 'Ji', and your network hard drive has 5T, where T is 'too'.


“Hertz” is a unit of frequency, so “terahertz” means a range of frequencies between 0.3 and 3 THz, corresponding to wavelengths between 1 mm and 0.1 mm. Therefore, in the field of electronics, electromagnetic waves in the terahertz band are known as millimeter waves or submillimeter waves; in the field of optics, they are called far infrared rays. As shown in the above figure, the electromagnetic wave in the terahertz band is smaller than the infrared (infrared remote control panel in the figure) and larger than the microwave frequency in the microwave oven.


Our human body emits infrared rays all the time. Similarly, the human body also emits rays in the terahertz band at all times. Too big to say that any object with a temperature higher than 10k will emit terahertz radiation.


Although the natural world is full of terahertz radiation, electromagnetic radiation in this band has not been studied intensively until the mid-1980s due to the inability to detect terahertz radiation with high sensitivity.


Now, due to advances in technology, terahertz research has become very popular. The international consensus is that terahertz is a new source of radiation with many unique advantages. The terahertz human body security instrument makes full use of these advantages.


The principle is that since the human body is emitting terahertz radiation at all times, and now, the technology allows us to detect these radiations with high sensitivity, then when there is a dangerous object on the passenger, it will carry out the terahertz issued by the human body. The occlusion, the different items, and the degree of occlusion are different. In this way, we can see the passenger's body at a glance without touching or undressing (undressing, slippers).


Some people may think that since the human body is also emitting infrared rays, why not use infrared rays?


This starts with the advantages of terahertz radiation.


First, the penetration of infrared light is not strong, while the terahertz radiation does not. It can penetrate fabric, paper and plastic.


Before the terahertz human body security instrument, the tools under the newspaper were undoubtedly revealed.


Compared with the previous security instruments, the terahertz human body security device has many advantages. For example, as mentioned above, there is no need to use a searchable body and other embarrassing methods. In addition, it does not emit radiation, only accepts the external radiation of the human body, dispelling the safety concerns of passengers; again, it is reliable, not only can detect metal substances, but also can detect ceramic knives, drug powders, liquid explosives. Non-metallic hazardous substances such as colloidal bombs; * After that, it is very efficient and can detect 500 people per hour, which is about 5 times that of traditional manual testing.


With so many advantages, what are the disadvantages? It’s too transparent. Looking at the human body is like watching a naked person who has stripped off his clothes. This is unacceptable to many people. However, this is not unsolvable. First, the passengers can be informed that the security inspectors sitting in front of the computer and 'closing' in the small house cannot see the passengers themselves.


The security inspector will not aim at the person, and then compare the images in the computer, in order to protect the privacy of passengers, this is not allowed.


After the passengers are not willing to do this security check, they can also voluntarily accept the 'search body' type of security.


Many accidents involving the destruction of planes, as well as subway bombings, etc., are the consequences of terrorists bringing dangerous goods to the vehicles. Therefore, the more the security personnel inspect each passenger carefully, it is responsible for the life of each passenger. We should have a positive attitude to face the inspection of security personnel for ourselves and for everyone.


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