The concept of using a digital readout such as a:Si–H
array or a CCD-coupled to a scintillator for neutron imaging
has previously been established [18]. However, there are
not many scintillators suitable for this task and there is a
need for the further research in this area [16]. The most
widely used scintillators in neutron radiography/diffraction
studies are 6LiF + ZnS (Ag) and Gd2O3S (GOS) [17,18].
These are powdered screens, which tend to scatter and
absorb their own light. The traditional compromise
between scintillator thickness needed for higher detection
efficiency and its spatial resolution makes powdered screens
less attractive for use in digital imaging. Another disadvantage
with such screens is that thicker scintillators, which are
needed for enhanced neutron absorption, tend to enhance
their sensitivity to gamma radiation also, resulting in significant
degradation in the signal to noise ratio.
The concept of using a digital readout such as a:Si–Harray or a CCD-coupled to a scintillator for neutron imaginghas previously been established [18]. However, there arenot many scintillators suitable for this task and there is aneed for the further research in this area [16]. The mostwidely used scintillators in neutron radiography/diffractionstudies are 6LiF + ZnS (Ag) and Gd2O3S (GOS) [17,18].These are powdered screens, which tend to scatter andabsorb their own light. The traditional compromisebetween scintillator thickness needed for higher detectionefficiency and its spatial resolution makes powdered screensless attractive for use in digital imaging. Another disadvantagewith such screens is that thicker scintillators, which areneeded for enhanced neutron absorption, tend to enhancetheir sensitivity to gamma radiation also, resulting in significantdegradation in the signal to noise ratio.
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