The purpose of this quantitative study was to examine the motivations guiding nuclear medicine technologists to pursue post-primary credentials in computed tomography (CT) or magnetic resonance imaging (MRI) through the framework of the expectancy-value theory. A survey was used to answer the research question: Do the values nuclear medicine technologists associate with a post-primary certification in CT or MRI predict their intention to pursue a post-primary credential? The study included certified nuclear medicine technologists from eight states in the southeastern regions of the United States. The answers from 237 respondent, which equates to 8.6% of the population, were used in the final analysis for the study. Multiple regression analysis was used to examine which predictor variables (i.e. years of experience, type of nuclear medicine technology program, expectancy belief, and subjective task values) may predict the intent to pursue a post-primary credential in CT or MRI. Findings show that attainment value, or importance of the task, was a predictor of future intent to pursue a CT credential. In addition, 'years of experience' was identified as a statistically significant contributing factor of whether nuclear medicine technologists pursue post-primary credentials in CT or MRI. The 'years of experience' predictor variable was inversely related with a technologist's intent to pursue a post-primary credential, suggesting as the technologist's years of experience increases by one standard deviation, the perceived intent to pursue a post-primary credential would likely decrease. Three implications were drawn from this study: 1) as the technologist increases in years, the likelihood of pursuing post-primary credentials decreases; 2) a post-primary credential in CT must have attainment value, meaning the credential must be important or personally significant; and 3) perceived barriers to pursing a post-primary credential are possible to overcome. Based on these implications, to increase the number of post-primary credentialed technologists, colleges and universities should focus recruitment efforts on early career technologists while increasing the technologist's attainment value associated with multiple credentials and the future of nuclear medicine technology. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]