Abstract: SEALED TECHNIQUES OF 85Kr GAS SOURCES Cai shanyu\ Zhou Zhenghe(Department of Isotope, China Institute of Atomic Energ y, Beijing 102413)Abstract\ Depending on the different kinds of 85Kr gas source and requests of application, the elaborate designs of source capsule are performed and a variety of welding techniques are used. The prototype tests indicate that the safety classification standard of 85Kr gas source s is up to GB/C22323. The quality of products can satisfy the requests of users.