Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8208489 | Applied Radiation and Isotopes | 2018 | 4 Pages |
Abstract
This paper demonstrates the ability of diamond sensors to respond to beta radiation. A Chemical Vapor Deposition (CVD) single crystal diamond was used in this work. The diamond crystal has a dimension of 4.5Ã4.5 by 0.5âmm thick. Metal contacts were fabricated on both sides of the diamond using titanium and palladium metals with thicknesses of 50ânm and 150ânm, respectively. The energy response of the diamond sensor was experimentally measured using three beta isotopes that cover the entire range of beta energy: 147Pm, a weak beta radiation with a maximum energy of 0.225âMeV, 2°4Tl, a medium energy beta radiation with a maximum energy of 0.763âMeV, and 9°Sr/9°Y, with both a medium energy beta radiation with a maximum energy of 0.546âMeV, and a high energy beta radiation with a maximum energy of 2.274âMeV. The beta measurements indicate that diamond sensors are sensitive to beta radiation and are suitable for beta spectroscopy. This is important in estimating dose since diamond is tissue equivalent, and the absorbed dose is easily determined from the energy and the mass of the active volume. The high energy betas from 2°4Tl and 90Sr/90Y penetrates the sensor without depositing sufficient energy in the active area because their range is larger than the thickness of sensor. The sensitivity of the detector is limited because of its small volume and can be improved by combining smaller area sensors since growing large size diamond is currently a challenge.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Modeste Tchakoua Tchouaso, Haruetai Kasiwattanawut, Mark A. Prelas,