X-rays are radioactive, but there is nothing to be gained by having only one x-ray of the hand. X-ray is a kind of electromagnetic radiation, but X-ray has high penetrating ability. We use X-rays to determine if there are changes in body structures, such as fractures and other illnesses. Although there is a certain amount of radiation, it is still an important tool for examining the body in the face of illness. In most X-rays, the dose of radiation used is actually quite small. However, clinical care is needed to avoid unnecessary tests and minimize the number of times. While a small number of X-rays on a child’s hand is not harmful, frequent X-rays may pose a risk of cancer. Therefore, parents should not be alarmed when their children have X-rays, but should consult a doctor to check the cause of the disease.