The key point of controversy over the Shenzhen Metro security machine incident lies in whether there is any radiation leakage around the security machine.There are reports that staff from Shenzhen Nuclear and Radiation Management Center have conducted tests,and at a distance of 5-10 centimeters from the surface of the security inspection machine on the side of the machine,the data obtained by the staff using handheld instruments is 0.1-0.2μSv/h(unit of radiation dose rate),price of lead plate.
  Professor Jiang Ningyi analyzed that this data is similar to the radiation values measured in the natural environment,which means that there is basically no radiation leakage on the side of the machine.According to media reports,the staff placed the detector about 10 centimeters away from the luggage entrance of the machine,and the measured value here is 0.7-0.8μSv/h.So,the radiation leakage at the luggage entrance and exit of the security check machine is the highest,and the further away from the security check machine,the smaller the radiation leakage.Professor Jiang Ningyi analyzed that according to China's"Basic Standards for Protection against Ionizing Radiation and Safety of Radiation Sources"(GB18871-2002),it takes a person to stand about 10 centimeters away from the entrance and exit of a security check machine for 52 days without moving,in order to reach the limit of one year.Therefore,this radiation value is actually very low and not enough to cause radiation damage to the human body.Pregnant women passing through the security screening machine will not have any impact on their unborn babies,so there is no need to worry or panic.