ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Nuclear Installations Safety
Devoted specifically to the safety of nuclear installations and the health and safety of the public, this division seeks a better understanding of the role of safety in the design, construction and operation of nuclear installation facilities. The division also promotes engineering and scientific technology advancement associated with the safety of such facilities.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
L. Rodrigo
Fusion Science and Technology | Volume 28 | Number 3 | October 1995 | Pages 1067-1072
Analysis and Accountancy | Proceedings of the Fifth Topical Meeting on Tritium Technology In Fission, Fusion, and Isotopic Applications Belgirate, Italy May 28-June 3, 1995 | doi.org/10.13182/FST95-A30548
Articles are hosted by Taylor and Francis Online.
The Jesse effect — the effect of common gaseous impurities on the ionization yield in noble gases, — was investigated as a function of the impurity concentration. Experiments were conducted using a specially constructed parallel-plate ionization chamber. A solid 63Ni, pure-beta emitter was used as the radiation source. Results showed a sharp increase in the ionization yield in He at low impurity concentrations (<∼1000 ppm) followed by a plateau at high concentrations (>∼4000 ppm) for all common impurity gases investigated. At the plateau, the ionization yield was found to be approximately 40–50% higher than the value obtained with ultra-high-pure He. According to these data, the magnitude of the tritium concentration measurement error associated with ionization chambers can be as high as 40–50% if common impurities are present in the He carrier. Since tritium itself is a Jesse effect-causing impurity in He, the calibration factor for a given ionization chamber will depend on the tritium concentration in He up to ∼350 TBq/m3. Only small changes in the ionization yield were observed for Ar. Therefore, common impurities will not impede the measurement of tritium in Ar with ionization chambers.