Single crystal diamond detector for radiotherapy

Abstract

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X-ray induced photocurrent characteristics of CVD diamond detectors with different carbon electrodes

“…Such value is smaller respect to those reported in literature for commercially available natural diamonds which show a gain factor around 0.5 [1,15,16]. However, it should be pointed out that the gain factor is not only affected by bulk properties of the diamond sample but also by the experimental parameters such as the magnitude of the electric field applied on the device.…”

Toward Pulse by Pulse Dosimetry Using an SC CVD Diamond Detector

“…Schottky diodes are expected to have very good linearity. Dose-rate linearities have been measured in singlecrystal CVD diamond detectors by a number of groups [6], [9], [22]- [28], several of whom determined a significant nonlinear response as a function of dose-rate [6], [9], [23], [27], [28]. A variety of methodologies were used, including varying the PRF, varying the source current in the case of X-ray sources, and varying the source to detector distance, which is the method that has been used here.…”

The influence of defect levels on the dose rate dependence of synthetic diamond detectors of various types on exposures to high-energy radiotherapy beams

“…(1) can therefore be expressed as (Laub et al, 1997;Bruzzi et al, 2000;Cirrone et al, 2006) (Planskoy, 1980;Ramkumar et al, 2001;Fidanzio et al, 2004;Laub et al, 1997Laub et al, , 1999Cirrone et al, 2006;Björk et al, 2000;Hoban et al, 1994;Marczewska et al, 2007;Górka et al, 2008;Lansley et al, 2009;Tranchant et al, 2008;Betzel et al, 2010;Schirru et al, 2010;Mohamed Abdel-Rahman et al, 2012) for both natural and synthetic diamonds, and a value of 1.20 has been stated for a silicon diode (Buttar et al, 2000).…”

“…The small dependence of Δ ( r2%) on beam energy observed with some of the crystals could therefore be attributed to the combined influence of defect levels within a given range and to the negligible energy dependence of diamond to radiation (this however depends on material purity and its uniformity) within a given energy range (Laub et al, 1997;van der Merwe and Keddy, 1999;Schirru et al, 2010). In particular, it is known that a lowimpurity natural diamond detector shows no energy dependence to photon radiation in the energy range from 4 to 25 MV (Laub et al, 1997) and to electron radiation in the energy range from 4 to 10 MeV (Laub et al, 1999).…”