We report the result of direct measurements of x-ray spectra performed using both, CdTe and CZT, diode detectors and narrow collimation. It was observed that a needle type collimator placed far away from the x-ray source (near 2 m) produced a huge deformation of the x-ray spectrum showing a significant amplification shoulder towards the high end of the energy distribution. The enhancement due to the collimator was recorded at different x-ray operating voltages and currents, and was compared with similar measurements using a slit collimator. The amplification can be explained as Rayleigh scattering by means of the Monte Carlo code MCSHAPE which takes into account the polarization effects in photon transport.
Selective amplification of x-rays in the energy range 50-65 keV
FERNANDEZ, JORGE EDUARDO;SCOT, VIVIANA;
2009
Abstract
We report the result of direct measurements of x-ray spectra performed using both, CdTe and CZT, diode detectors and narrow collimation. It was observed that a needle type collimator placed far away from the x-ray source (near 2 m) produced a huge deformation of the x-ray spectrum showing a significant amplification shoulder towards the high end of the energy distribution. The enhancement due to the collimator was recorded at different x-ray operating voltages and currents, and was compared with similar measurements using a slit collimator. The amplification can be explained as Rayleigh scattering by means of the Monte Carlo code MCSHAPE which takes into account the polarization effects in photon transport.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
