Will X-ray Security Check radiation cause short-lived

 At present, Beijing, Shanghai and other cities have implemented the subway normalized security checks. Some people are worried about that the X-ray security checkpoint radiation is harmful to human body.
Misgivings 1: Is security equipment radiation harmful to health?
Same as medical X-ray diagnostic instrument, baggage X-ray security equipmentalso use X-ray to get the internal image of the object.But the radiation of baggage security equipment is much less than medical X-ray diagnostic instrument, because the baggage image does not need to achieve the resolution of the level of medical diagnosis.
According to the national standard GB 15208.1-2005, per dose of X-ray baggage scanner shall be ＜5μSv, and the leakage shall be＜5μSv/h if testing 5cm from the housing of the X-ray scanner. However, the actual leakage of the X-ray security scanner applied in the airport or stations is much less than this figure. So, it is safe to human body.
Although the radiation is little, we still suggest you stay as far as possible away from exit of the X-ray tunnel..
Misgivings 2: If we take the subway every day, is the cumulative radiation harmful to the body?
How much radiation getting from security check for passengers a year, we have no specific data at present.Absolutely, the security check personnel has much more radiation than passengers. In 2003, the United States disease control and prevention center had a survey inits six major airports.The survey indicated that the radiation for the majority (89%) of the airport security personnel is less than 12 mrem, namely 120μSv, the remaining 11%workers is less than 60 mrem, namely 600μSv.
And the UN radiation standard for each person is ≤ 1000μSv per year, which is much more than what we get from the security check.
Misgivings 3: Does X-ray security equipment have any impact to the scanned items?
Because the radiation of X-ray baggage security equipment is very little, it is negligible for the scanned items.