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.
Explore membership for yourself or for your organization.
Conference Spotlight
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
August 2025
Fusion Science and Technology
Latest News
Deep Space: The new frontier of radiation controls
In commercial nuclear power, there has always been a deliberate tension between the regulator and the utility owner. The regulator fundamentally exists to protect the worker, and the utility, to make a profit. It is a win-win balance.
From the U.S. nuclear industry has emerged a brilliantly successful occupational nuclear safety record—largely the result of an ALARA (as low as reasonably achievable) process that has driven exposure rates down to what only a decade ago would have been considered unthinkable. In the U.S. nuclear industry, the system has accomplished an excellent, nearly seamless process that succeeds to the benefit of both employee and utility owner.
Neng-Chuan Tien, Shih-Hai Li
Nuclear Technology | Volume 155 | Number 2 | August 2006 | Pages 208-225
Technical Paper | Radioactive Waste Management and Disposal | doi.org/10.13182/NT06-A3757
Articles are hosted by Taylor and Francis Online.
A numerical model was developed to analyze radioniclide transport within saturated fractured rock that accounts for the effect of nonlinear kinetic sorption of radionuclides on groundwater colloids. The interactions between radionuclides and colloids are assumed to be nonlinear and kinetic, while sorption of radionuclides on fracture surfaces and in rock matrix is described by a sorption distribution coefficient. Colloids may move with a velocity that is higher than the mean groundwater velocity. However, as there are insufficient data with which to assign a priori colloid velocity, we use a theoretical model based on hydrodynamic chromatography to evaluate the colloid velocity within a single fracture.Calculation results show that external surface forces acting on colloids could alter both the mobility of colloids and the host population of radionuclides in groundwater. The results also indicate that colloid-facilitated transport occurs depending on colloid concentration. Moreover, a simple two-member radionuclide decay chain is assumed and incorporated into the kinetic model.