Delmar L. Barker

On the 14C content in radioactive ores

Abstract U and Th ores have been found to contain significant levels of 14C. The levels of this isotope can be as high as 14 C α =1.7 · 10 −9 , and can be explained in terms of nuclear reactions and some contribution from heavy-ion emission or asymmetric fission. The levels of 14C are compared to other nucleogenic isotopes that have been found in these ores, such as 10Be, 26Al and excesses of rare-gas isotopes.

Tunable continuous wavelet and frame transforms

Continuous wavelet transforms (CWT) and frames have always been useful for noise suppression, edge detection and medical signal processing. However, these transforms are generally shied away from since computational complexity prevents their widespread use. However, recently developed processor technology that uses analog rather than digital signal processing hardware may be the ideal means to implement and apply these algorithms. It is then appropriate to consider new types of frames and continuous wavelet systems. We propose two families of tunable continuous wavelet systems with widely varying frame bounds and scaling behavior, and illustrate examples of computations involving these systems.