Simply speaking, radioactive particle implantation means that radioactive slow-release particles are implanted into the tumor or the tumor-infiltrated invaded tissues with special puncture needles under the direct vision of CT and ultrasound, which can inhibit and kill tumor cells continuously and uninterruptedly for a certain period of time (effective time 30-60 days) through the efficacy of continuous release of drugs, so that the local tumor can be controlled most effectively. At the same time, because the radioactive particles only have a continuous effect on local area, it has less impact on liver, kidney and systemic organ functions and less adverse effects. When it comes to tumor treatment, people may not be unfamiliar with systemic radiotherapy, but “particles” are special particles made of radioactive substances, which are implanted into the tumor body through implantation for “internal radiotherapy”. In recent years, due to the successful development of “particles” and the continuous progress of scintillation technology, the technology of radioactive particle brachytherapy for tumors has been rapidly developed. At present, particle implantation has achieved encouraging results in the treatment of lung, liver, pancreas, prostate, lymph nodes, breast and other tumors at home and abroad, and many inoperable patients have been treated effectively. Particle implantation is simple, less traumatic and relatively inexpensive. It is also suitable for malignant tumors that cannot be removed surgically for various reasons because it can be positioned under direct vision of CT and ultrasound, with high accuracy, and the drugs can be fully utilized with minimal systemic effects on the patients. It is especially suitable for malignant tumors that cannot be removed surgically for various reasons. Some literature reports that it can also be combined with surgery, and radioactive particles can be implanted directly into lesions that cannot be removed during surgery to improve the cure rate and reduce the recurrence rate of tumors. Our department has introduced this technology for many years. Many cases of clinical practice have proved that radioactive particle implantation for all stages of malignant tumors has good efficacy in improving clinical symptoms and quality of life, and can be an important treatment for progressive tumors. Of course, particle implantation requires physicians to have skilled operation skills and master strict treatment norms and operation protocols, the most critical of which is strict dose assurance.