Radioactive Particle Analysis by Digital Autoradiography
Cynthia J. Zeissler, Richard M. Lindstrom, J P. McKinley
We have been exploring ways to evaluate the activity of radioactive particles that have been detected by phosphor plate digital autoradiography based on photostimulated luminescence (PSL). A PSL system with 25υ pixel digitization has been applied to particle analysis problems, both qualitatively and quantitatively. Two data evaluation methods are currently employed:(1)bulk area signal measurement, and (2) discrete event counting which may include spectral evaluation. The first method is conventional whereas the second method requires high spatial resolution and is presented here for the first time. The counting methods can discriminate between alpha and background counts. The unshielded background signal accumulation rate was determined by the bulk area method. Using the spectral method of evaluation for α-particle events, the mean signal intensity per recorded α-particle was measured, and the detective quantum efficiency (DQE) was found to be nominally 100 %.
Journal of Radioanalytical and Nuclear Chemistry
autoradiography, environmental radioactivity, hot particles, image processing, imaging plate, phosphorplate