Flaw detection is mainly used to detect cracks and defects within the metal, commonly used flaw detection methods, including X-rays or ultrasound, gamma rays, etc., with radioactive substances. Flaw detection, if the human body is not well protected, the above-mentioned rays will all cause some harm to the human body, and prolonged exposure to radiation has a greater impact on the human body. If the body is in the range of radiation for a long time, the body cells can lead to energy metabolism disorders, so that limb weakness. If often exposed to the probe and not well protected, the radiation of the probe will damage the human cell tissue, resulting in human cell mutation, the human reproductive system or blood system, the nervous system will have a greater impact, such as leading to infertility. And the chance of cancer will be several times higher than people working in a normal environment, which may cause liver cancer, breast cancer, etc.. It can also lead to blood diseases, or optic nerve damage, hearing damage, etc. Therefore, in order to prevent serious damage to the human body from probing, it is recommended to wear protective clothing and gloves during probing operations, and you need to avoid working for too long. At the same time, the work should be as far away from the source of radiation as possible, and the operating area should be equipped with effective shielding devices.