According to Health Physics Society, walk through metal detectors on airports give off non-ionizing radiation, therefore long term exposure to these will not increase any risk of birth defect as well as miscarriage.
The truth is that metal detectors located on airports use a low-frequency electromagnetic field, and their main purpose is searching for weapons. Even household appliances that we have in our homes produce some kind of electromagnetic field, so exposure of pregnant women to such sources of radiation, including wands that most of the security personnel use to scan passengers is considered safe.
A lot of people assume that walk through metal detectors in airports use X ray to detect metals, but they don’t. From the other side, X-ray scan is used for luggage scan, and the radiation they emit has the same power as dental X-ray used in dentists offices. These metal detector devices used for luggage scanning are completely safe for those who work with it as they are shielded from employees.
There are two different types of metal detectors installed in US airports. Both of these types of detectors are used to detect objects that might be hidden under the clothes. One of these detectors raised health concerns as it uses low X rays, and the other one is less controversial though as it works on the principles of electromagnetic waves.
However, TSA (Transportation Safety Administration) claims that the backscatter machines that use low X rays are not dangerous and that they don’t represent any risk for pregnant women. From the other side, medical experts want to know whether those walk through metal detectors have been testes thoroughly enough. The question is what would happen if those metal detectors would stop to work properly. Would they emit more radiation without anyone noticing that issue? For this reason, a lot of passengers, including pregnant women opt for a pat-down search instead, which is much safer.
The radiation of walk through metal detectors is in most situations considered safe, and even accidental exposure to rays in baggage handlers will not cause any harm. Also, since a lot of people transport baby food and other important items such as medicine, in their hand luggage, there are no long term effects on their exposure to metal detectors.
Ionizing radiation can increase the risks of birth defects and miscarriage, however most of the metal detectors use non-ionizing radiation, or some that use give off a much lower level of radiation. Radiation is measured in RED, ROENTGEN or REM units. In international equivalent these units are SIEVERT or GRAY. Saying this, pregnant women shouldn’t be exposed to more than 0.5 REM during their entire pregnancy, or 0.05 REM per month. For example, a 3 hour round flight can exposure a pregnant woman to 0.005 REM and at the same time the overall effect of a walk though metal detector in that case will be totally negligible.
In conclusion, walk through metal detectors cannot harm a pregnant woman and its fetus, but it is advised that women, who are working with such and similar equipment very often, be prudent. Staying away from such devices as much as possible is beneficial to anyone´s health. There are as well badges that can be worn on a shirt that measures the radiation levels, which is recommended to people that are concerned about long term radiation exposure.
Unfortunately, there are many inaccurate sources on the internet. The internet has hosts of pages that have not been updated since the FDA issued their statement, and these pages proclaim warnings and spread fear. No wonder people are still concerned! Yet times have changed, and apparently, the FDA succeeded to some degree in eliminating the threat metal scanners pose for pacemakers.
The American Heart Association has a page designated to the do’s and do not’s for those with pacemakers. The Association tells the public that, in general, metal detectors are safe. They assure those with pacemakers that “interactions with MD are unlikely to cause clinically significant symptoms in most patients.” The author goes on to suggest that if a metal detector wand is being used, “tell the security personnel that you have a pacemaker. Ask them not to hold the metal detector near the device any longer than is absolutely necessary.” The American Heart Association last updated this page in 2012, and is a highly trusted source.
People like Kira can live in confidence, assured that their pacemaker and more importantly, their way of life are safe from the effects of metal detectors. These no longer pose any significant threat to those who once had a cause to fear them. Pacemakers and metal detector wands can finally co-exist peacefully in a world where security is essential.
In order to ensure a speedy trip through the metal detector so you can get on with your day it is important to understand how metal detectors work. In the simplest terms, a metal detector uses an electromagnetic force to detect all types of metal. It is a safe and effective method of detecting materials that can be used to make weapons and can therefore stop people from brining dangerous items into high traffic areas.
Unfortunately, we use metal in plenty of non-lethal products as well and therefore going through a metal detector can turn into a bit of a chore. It can be a bit cumbersome to make sure you will pass on the first time for sure. Here are a few tips that could help you make the most of things.
1. Plan Ahead – most of the time you will know in advance that you will be encountering a metal detector so take steps ahead of time to ensure you won’t set it off. Know the rules on what is allowed and what is not and leave unnecessary items at home.
2. Keep Shoes in Mind – many metal detector processes these days include you taking off your shoes so they can be properly x-rayed so wear comfortable shoes that are easy to take on and off.
3. Avoid Metal – minimize the amount of metal you are carrying with you including jewelry, metal belt buckles, extra change, metal in clothing, cuff links, etc. Some metal cannot be avoided, just be prepared to remove it if possible or to let the operation know if there is something you cannot remove.
Use the time you are standing in line waiting to remove items and prepare for your own turn through the detector. Remember to remain calm and friendly when dealing with the operators, they are only doing their jobs!
In a dual-energy X-ray system, the X-rays pass through a detector, a filter and then another detector.
After the X-rays pass through the item, they are picked up by a detector. This detector then passes the X-rays on to a filter, which blocks out the lower-energy X-rays. The remaining high-energy X-rays hit a second detector. A computer circuit compares the pick-ups of the two detectors to better represent low-energy objects, such as most organic materials.
Since different materials absorb X-rays at different levels, the image on the monitor lets the machine operator see distinct items inside your bag. Items are typically colored on the display monitor, based on the range of energy that passes through the object, to represent one of three main categories:
While the colors used to signify "inorganic" and "metal" may vary between manufacturers, all X-ray systems use shades of orange to represent "organic." This is because most explosives are organic. Machine operators are trained to look for suspicious items -- and not just obviously suspicious items like guns or knives, but also anything that could be a component of an improvised explosive device (IED). Since there is no such thing as a commercially available bomb, IEDs are the way most terrorists and hijackers gain control. An IED can be made in an astounding variety of ways, from basic pipe bombs to sophisticated, electronically-controlled component bombs. A common misconception is that the X-ray machine used to check carry-on items will damage film and electronic media. In actuality, all modern carry-on X-ray systems are considered film-safe. This means that the amount of X-ray radiation is not high enough to damage photographic film. Since electronic media can withstand much more radiation than film can, it is also safe from damage. However, the CT scanner and many of the high-energy X-ray systems used to examine checked baggage can damage film (electronic media is still safe), so you should always carry film with you on the plane.
Electronic items, such as laptop computers, have so many different items packed into a relatively small area that it can be difficult to determine if a bomb is hidden within the device. That's why you may be asked to turn your laptop or PDA on. But even this is not sufficient evidence since a skilled criminal could hide a bomb within a working electronic device. For that reason, many airports also have a chemical sniffer. This is essentially an automated chemistry lab in a box. At random intervals, or if there is reason to suspect the electronic device that someone is carrying, the security attendant quickly swipes a cloth over the device and places the cloth on the sniffer. The sniffer analyzes the cloth for any trace residue of the types of chemicals used to make bombs. If there is any residue, the sniffer warns the security attendant of a potential bomb. In addition to desktop sniffers like this, there are handheld versions, that can be used to "sniff" lockers and other enclosed spaces and unattended luggage.
Almost all airport metal detectors are based on pulse induction (PI). Typical PI systems use a coil of wire on one side of the arch as the transmitter and receiver. This technology sends powerful, short bursts (pulses) of current through the coil of wire. Each pulse generates a brief magnetic field. When the pulse ends, the magnetic field reverses polarity and collapses very suddenly, resulting in a sharp electrical spike. This spike lasts a few microseconds (millionths of a second) and causes another current to run through the coil. This subsequent current is called the reflected pulse and lasts only about 30 microseconds. Another pulse is then sent and the process repeats. A typical PI-based metal detector sends about 100 pulses per second, but the number can vary greatly based on the manufacturer and model, ranging from about 25 pulses per second to over 1,000.
If a metal object passes through the metal detector, the pulse creates an opposite magnetic field in the object. When the pulse's magnetic field collapses, causing the reflected pulse, the magnetic field of the object makes it take longer for the reflected pulse to completely disappear. This process works something like echoes: If you yell in a room with only a few hard surfaces, you probably hear only a very brief echo, or you may not hear one at all. But if you yell into a room with a lot of hard surfaces, the echo lasts longer. In a PI metal detector, the magnetic fields from target objects add their "echo" to the reflected pulse, making it last a fraction longer than it would without them.
A sampling circuit in the metal detector is set to monitor the length of the reflected pulse. By comparing it to the expected length, the circuit can determine if another magnetic field has caused the reflected pulse to take longer to decay. If the decay of the reflected pulse takes more than a few microseconds longer than normal, there is probably a metal object interfering with it.
2).For security purposes, security metal detectors need to be equipped with technology that will allow you to determine what kind of metal is going through your establishment and if so, how many. And while metal detecting is critical you need to make sure it can discriminate between metals and personal effects. A detector that cannot distinguish between the two can cause delays and frustration, on your part as well as your customers, so test the system before deciding to buy it.
1.Hand held metal detectors
Hand held metal detectors come in different styles, but the best ones have an ergonomic design. 1).It would be nice if the detector has an offset hand grip so your hand doesn’t get in the way when inspecting a sensitive spot. 2).A well made detector also won’t have sharp corners or edges that might get in the way as you pass the device over a particular area. In other words, the mechanical design has to be such that it doesn’t get in the way of folds, buckles, buttons and other articles of clothing. 3).While shopping for a metal detector, make sure you choose one that has uniform sensitivity for non-magnetic and magnetic targets including stainless steel. 4).At the same time you should test the device for body compensation and be certain that it is not vulnerable to disturbances from mechanical and electromagnetic influences. This is particularly important because it might affect its accuracy.
5).Needless to say, the device must be 100% digital and have all the essential functions you are looking for. Only you can decide what functions are needed by your company, but at the very least it should have a magnetic field receiver/transmitter, a USB port, external communication and a digital operator interface. Well designed security metal detectors also don’t require calibration.
Other Features to Look For
6).Assess the control panel and ensure the switches are easy to identify, with appropriate warning lights. Besides consistent and reliable performance, the device should not be affected whether it is used indoors or outdoors. A portable detector moreover, needs to have a long battery life and should be fully rechargeable too.
7).These devices have different alarm indicators, but for use in airports and hotels, the signal should be either fixed or commensurate to the object that it has detected. You can also get a vibrating detector, although many devices actually have several indicators built-in.
*Phillines, PY-5030A X ray baggage scanner in July, 2020.
*Guangzhou(China) Best Express OEM PY-10080 X-ray baggage scanners in 2018.
*PY-5030A used in one factory from Vietnam in 2020.
*Project for one Turkish mall-X ray baggage scanner PY-5030A, walk through metal detector PY-5800, and hand held metal detector GP 3003B1 in 2019.
*Hydraulic automatic bollards used in China
*Hydraulic automatic bollards for one construction site in Africa in 2018.
*The Parliament of Georgia used our PY-6550 scanner and PY-3000 walk through detector and turnstile 2018
*One Jail project in Saudi Arabia in 2019 June.
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