On the energy transfer in LiMgPO₄ doped with rare-earth elements

Abstract

The phosphates LiMgPO4: RE (RE - Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm) with olivine-type orthorhombic structure were synthesized by the conventional solid state reaction route and their optical...

LiAlO2:Gd-Based Versatile and Ultrasensitive Detector for Gamma and Neutrons by Thermal and Optical Stimulation

“…To make any phosphor neutron sensitive, isotopes with high neutron capture cross sections such as 6 Li, 10 B, 157 Gd, and 155 Gd are used in the matrix. In the case of 6 Li(n,α) and 10 B(n,α) neutron-capture reactions, the products are heavy particles ( 3 H, 4 He, or 7 Li, depending on the reaction) in the energy range of 2−4.8 MeV, which deposit the energy locally in the matrix. 4 Subsequently, 157 Gd and 155 Gd are among the two naturally occurring isotopes of Gd with significantly large thermal neutron-capture cross sections (254000 and 60 900 barn, respectively), and upon interaction with thermal neutrons, these isotopes produce γ rays (maximum energy of 7.937 and 8.536 MeV, respectively) and low-energy (29−246 keV) conversion electrons (beta rays).…”

“…Similarly, Gd 3+ -doped BaZn 2 (PO 4 ) 2 glass-ceramics has been investigated for radiation measurement applications and has showed good dosimetric performance, indicating their potential applications in radiation dosimetry . In another study, the doping of BEO phosphor with Gd 3+ and Gd-doped LiMgPO 4 was also studied. , All these studies are based on the thermally stimulated luminescence (TL) properties of phosphor materials, and the use of optical stimulation (OSL) for dose measurement has not been reported.…”

“…In medical and natural sciences, a widespread practice to determine the neutron and gamma ray components in a mixed radiation field utilizes a paired ionization chamber, i.e., a hydrogeneous ionization chamber for the detection of neutrons and a non-hydrogeneous chamber that quantifies the photon fraction. 3 Working on the same philosophy, health physicists use paired dosimeters based on 6 LiF− 7 LiF phosphors, with 6 Li sensitive to both gamma and neutrons while 7 Li sensitive only to gamma for dose quantification in a mixed gamma-neutron field.…”

“…5 In another study, the doping of BEO phosphor with Gd 3+ and Gd-doped LiMgPO 4 was also studied. 6,7 All these studies are based on the thermally stimulated luminescence (TL) properties of phosphor materials, and the use of optical stimulation (OSL) for dose measurement has not been reported.…”

Dosimetric and spectroscopic study of LiMgPO4 doped with Tm3+ and Er3+

“…42 Considerable research [43][44][45][46][47] has also been conducted on defects in prepared and irradiated lithium magnesium phosphate. Kellerman et al 48 synthesized LiMgPO 4 :RE (Re-nd, Sm, Gd, Tb, Dy, Ho, Er, Tm) phosphate by conventional solid phase reaction method, and studied its optical properties by experimental and theoretical methods. Miao et al 49 designed and developed a promising wideband SWIR phosphor by introducing Cr 3+ -Ni 2+ ion pair into LiMgPO 4 host.…”