Abstract
There has been considerable interest in inorganic scintillators based on lutetium due to their favorable physical properties. Despite their advantages, lutetium-based scintillators could face issues because of the natural occurring radioisotope of 176Lu that is contained in natural lutetium. In order to mitigate its potential shortcomings, previous works have studied to understand the energy spectrum of the intrinsic radiation of 176Lu (IRL). However, few studies have focused on the various principal types of photon interactions with matter; in other words, only the full-energy peak according to the photoelectric effect or internal conversion have been considered for understanding the energy spectrum of IRL. Thus, the approach we have used in this study considers other principal types of photon interactions by convoluting each energy spectrum with combinations for generating the spectrum of the intrinsic radiation of 176Lu. From the results, we confirm that the method provides good agreement with the experiment. A significant contribution of this study is the provision of a new approach to process energy spectra induced by mutually independent radiation interactions as a single spectrum.
Highlights
There has been considerable interest in inorganic scintillators based on lutetium, such as lutetium oxyorthosilicate (LSO) and lutetium yttrium oxyorthosilicate (LYSO), for use in positron emission tomography (PET) due to their favorable physical properties including high detection efficiency (≈0.86 cm−1, linear attenuation coefficient at 511 keV), fast decay time (≈40 ns), and high light yield (≈80% NaI (Tl)) [1,2]
The results of the simulation were modified based on the following equation considering the pathway yield of the isomer transition, which was assumed in advance
The total peak ratio (T) of the isomer transition was induced by the yield (Y), interaction probability (P), and full-energy peak efficiency (E)
Summary
There has been considerable interest in inorganic scintillators based on lutetium, such as lutetium oxyorthosilicate (LSO) and lutetium yttrium oxyorthosilicate (LYSO), for use in positron emission tomography (PET) due to their favorable physical properties including high detection efficiency (≈0.86 cm−1 , linear attenuation coefficient at 511 keV), fast decay time (≈40 ns), and high light yield (≈80% NaI (Tl)) [1,2]. Despite their advantages, lutetiumbased scintillators could face issues in single transmission measurement, low sensitivity imaging, and wide energy window-scanning because of the natural occurring radioisotope of 176 Lu that is contained in natural lutetium [3,4,5]. The intrinsic radiation of 176 Lu (IRL) could create background noise in apparatuses as a uniformly distributed radiation source in scintillation crystals
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