A system for forming a purse string suture, including a suture applicator having a proximal handle, a length of suture wound on a spool, and a hollow suture needle extending from a distal end of the handle. Each table entry maps a hash value to a server in the server group. TBET cassettes may be used to label biological molecules, in clothing dyes, and in cosmetics. The radiation source module is particularly useful for ultraviolet radiation of wastewater while having the advantages of in situ cleaning of the radiation source when it becomes fouled. In case of collision, the chamber is not bound by the bumper absorber deformed by the impact of the collision, thereby enabling an accurate detection of the collision of the vehicle with the object.