Security gate has radiation, will not affect your health

Subway security machine and railway stations, airports and important departments of the import and export of security equipment, is to detect items of a device, a variety of types, the most common is the channel X-ray machine, simply put, is the use of X-rays through the price of the principle of imaging, the object through the security machine to obtain X-image, the image is then processed through the computer, the computer screen can be displayed to identify the image and assess the safety of the object. This is similar to the hospital to do human X-ray examination, the difference is that the security machine X dose is far lower than the medical X equipment, its tube current is 0.4 ~ 1.2mA, while the medical chest X-ray machine is at least 50mA, that is, 50 times. There is no need to doubt that there must be a certain dose of X-rays in the studio inside the security screening machine, but the human body does not enter, and will not be exposed to the rays. The key question is whether there is any radiation leakage around the screening machine, if there is leakage, it may have a certain impact on the long-term exposure of the staff, while the impact on the one-time passer-by is not significant. Generally speaking, an inspected and qualified security machine is not such a possibility, it should be safe, its standard leakage dose of 0.05?Gy/h (1Gy is equivalent to about 1000mSV or 1Sv), this data is close to the natural radioactive background.

Recently reported, in the side of the machine from the security machine machine surface 5cm to 10cm, the staff with a hand-held instrument to detect the data obtained is 0.1μSv/h to 0.2μSv/h, this data and the natural environment measured values are similar, that is to say, the side of the machine basically does not exist radiation leakage. The staff also put the detector to the machine's luggage entrance and exit about 10cm, where the measured value is slightly higher, for 0.7μSv/h to 0.8μSv/h. The security machine staff concluded that the security machine baggage entrance and exit of the highest amount of radiation leakage, the farther away from the security machine, the smaller the amount of radiation leakage. According to China's "ionizing radiation protection and radiation source safety basic standards" (GB18871-2002), the public is subjected to artificial radiation dose a year can not exceed 1mSv, according to the calculation, a person standing in the security machine entrance and exit of about 10cm in 52 days without moving to reach this amount. As for occupational personnel, the state regulations stipulate that the average annual dose should not exceed 20 mSv, and they can stay continuously for 2.85 years. Therefore, it can be said that this radiation value is actually very low, not enough to cause radiation damage to the human body, pregnant women passing through the security machine will not have an impact on the baby in the womb, there is no need to count, not to mention worry and panic. Be careful not to let the body into the security check of the ray inspection area (do not rush to the X-ray security check area) to take things.

Whether or not radiation has an effect on the human body depends on the amount of radiation received at one time, the total amount of radiation received, the time of exposure, and the body's ability to regulate this radiation. Medical radiation, to which the average person is most exposed, is needed for diagnostic and therapeutic purposes. There is a basic principle in medical exposure, is the exposure to radiation justification, optimization and dose limitation, that is, there is a legitimate reason, the choice of the most superior technology and equipment, within certain limits to receive a small amount of radiation and get the maximum benefit. Security machine due to low radiation dose, the physical impact is close to zero, generally does not affect the surrounding population, including the physical health of the staff. This equipment is the security sector to use "conventional weapons", reasonable and standardized use is indisputable. As for how to standardize, how to layout, how to manage, how to make the people feel at ease is another issue worthy of discussion.