| 摘要 |
In a post-accident sample needle system, at the sample station, an improved seal for a PASS liquid sample needle is disclosed. In such systems, a bottle with a septum is impaled on paired needles. The first needle provides venting, and the second needle provides for the placement of potentially radioactive samples in the bottle through the septum. A needle of the hypodermic type having an angled point is provided with a flared end remote from the point. A rubber O-ring fits over the needle adjacent the flare having an inner circumferential diameter that permits passage along the length of the needle and trapping at the end of the needle adjacent the flare. The O-ring is captured at the flared end of the needle by a conventional compression nut. The nut, when tightened, compresses the O-ring to circumferentially expand beyond the edges of the flare to form a seal between the needle and O-ring and to form a secondary seal between the bore and O-ring. In the expansion of the O-ring, the needle is self-centered and braced for the dispensing of a sample.
|
