Nitrogen-13 is a radioisotope of nitrogen used in positron emission tomography (PET). It has a half life of a little under ten minutes, so it must be made at the PET site.
双语例句
1
The removal of nitrogen has gone from 13% to 85%; phosphorus from 44% to 64%; and colours and dyes from 52% to 80%.
水中氮、磷和印染颜料的去除率分别从13%、44%和52%增到85%、64%和80%。
2
In the refrigerant container (11), a liquid nitrogen layer (13) on the cryogenic temperature side and a nitrogen gas layer (14) on the normal temperature side are arranged next to each other.
在该制冷剂槽(11)中，低温侧上的液氮层(13)和室温侧上的氮气层(14)彼此相邻布置。
3
Compared with the treatment without DMPP, nitrogen recovery rate was improved by 13. 4% in the treatment adding DMPP on conditions top-dressing with top-dressing and lower application rate.