Advantages of Iodine 125 sealed pellet source implantation: Implantation by surgical or percutaneous puncture with minimal surgical damage. The diameter of the radiation is only 1,7CM to realize precise radiation therapy and reduce the dose to normal tissues. The half-life of the source is 60.1 days, after one year, only 1.6% of the original energy remains. The titanium alloy tube is compatible with human tissues, and the laser welding seal ensures that the radiation source does not leak, avoiding sensitive tissues (such as the thyroid gland) from being exposed to radiation leakage and causing danger. Continuous low-dose irradiation treatment can make the tumor cells with different division cycles of the tumor tissue get uniform irradiation and improve the irradiation efficiency. Under the guidance of CT, MRI or B ultrasound, the treatment plan is formulated through the Treatment Planning System [TPS], which accurately calculates the number of radioactive particles to be implanted and their distribution, so as to ensure that the tumor tissues can be killed to the maximum extent, and at the same time effectively protect the surrounding normal tissues and sensitive organs. Safe, reliable, fast and easy, choose the angle of the gold needle at will, and multiple choices of particle arrangement at the level. The radioactive source is always stored in a special container, and the staff always do not directly contact the particle source during the operation, which makes the operation safe and easy to protect. Tumor categories adapted for treatment Head and neck tumors: tongue cancer, nasopharyngeal cancer, upper frontal sinus cancer, parotid adenocarcinoma, oropharyngeal cancer, tonsil cancer. Tumors of chest: esophageal cancer, lung cancer, breast cancer. Tumors of digestive tract: stomach cancer, liver cancer, pancreatic cancer, bile duct cancer, rectal cancer. Tumors of nervous system: glioblastoma. Genitourinary system tumors: prostate cancer, uterine cancer, endometrial cancer, vaginal cancer.