Eu: SrI2 crystal is a kind of scintillation crystal with excellent performance. It has the advantages of large atomic numbers, high light output, extremely low energy resolution, and small afterglow time. Its disadvantage is that it is very deliquescent and has relatively long decay time. Therefore, Eu:SrI2 crystal is very suitable for nuclear technology fields that do not require high decay time but high light output and energy resolution performance, such as gamma-ray spectroscopy, element isotope discrimination, and scintillation detectors for safety inspection equipment. It has potential applications in industrial and medical CT, ultra-high-resolution X-ray imaging, and other fields.
The emission wavelength of Eu:SrI2 crystal is between 400-500nm, which matches the spectral sensitive area of mainstream photomultiplier tube (PMT), which is conducive to scintillation photon detection. At the same time, unlike most rare earth-doped scintillation materials, Eu2+ in Eu: SrI2 crystal is doped as SrI2 activator. Because of its serious radiation trap effect, a high concentration of Eu2+ will reduce its scintillation performance, generally considered to be 5%mol concentration is its optimal concentration.
|Chemical formula||Eu: SrI2|
|Melting point (℃)||538|
|Atomic number (effective)||49|
|Thermal expansion coeff (C-1)||21.64*10-6|
|Wavelength(Max. emission) (nm)||435|
|Light output relative to Nal(Tl) (%)||130|
|X-ray Absorption Coef. at 100 KeV(cm-1)||2.88|
|X-ray Absorption Coef. at 662 KeV(cm-1)||0.13|