Orthographic photography of spine

It is difficult for me to decide whether it is 10 or 5 times, because it depends on the working procedure of the machine where you go for X-ray examination. I don't know much about this, but I can analyze the dose and irradiation conditions for you. The condition of 640mA is really unusual, but according to the time of 0.050s, 640mA*0.050s=32mAs is right. The dose of finding an X-ray is about 5~ 10mSv, and taking five X-rays for a child aged 13 is a relatively large dose, which is barely acceptable for diagnosis, even if it is ten times, considering that the advantages outweigh the disadvantages. But if the overexposure is really caused by the mistake of the hospital, you should ask for an explanation. The relatively large dose I am talking about here is relative, and there will be no obvious physical reaction. Within your daughter's measurement range, the possibility of getting sick because of radiation will happen immediately, maybe for years, maybe for decades, or maybe not. Because children still have a long way to go, they should receive as little radiation as possible in the future and eat more vegetables and juice, especially kelp, so as to recuperate.