The use of electron spin resonance techniques to determine gamma ray exposure of $\alpha$-keratin in human hair January 1997 in “ Purdue e-Pubs (Purdue University) ” Thomas Johnson We don't know much about this study yet. We're maintaining the world's largest resposity of hair loss research. You can help out the community by sending a PDF of this study here . Not sure how to get a study's PDF? You can email the authors of the study. View this study on docs.lib.purdue.edu →