LuAG(Pr) Scintillator Crystal

Lutetium Aluminium Garnet - LuAG(Pr) - is a relatively dense scintillator with a fast decay time (20ns). It’s peak emission is at 310nm. Good temperature properties.

LuAG(Pr) scintillator crystals have:

Mechanically robust characteristics and are non-hygroscopic
Stable scintillating characteristics up to c.100 rad
Virtually no afterglow emissions
No cleavage planes, so can be easily machined into various shapes and geometries

LuAG(Pr) scintillator crystals have the following issues which should be noted. They:

Have a light emission which a is good part is above 500nm, a region where photomultipliers are less sensitive
Are intrinsically radioactive making it unacceptable for some applications
Are susceptible to radiation damage, starting with doses between 1 and 10 Gray (10⁸ - 10⁹ rad). Reversible with time or annealing.

LuAG(Pr) scintillator crystals are useful in diverse applications such as:

Positron Emission Tomography (PET)
Imaging screens

LuAG(Pr) Scintillation Crystals - Optical Properties

Property	Units	Value
Wavelength (Max. Emission)	nm	310
Wavelength Range Cut-off	nm	TBA
Decay Times	ns	20
Light Yield	photons/keV	22
Photoelectron Yield	% of NaI(Tl)	20
Radiation Length	cm	1.41
Optical Transmission	µm	TBA
Transmittance	%	TBA
Refractive Index		2.03 @310nm
Reflection Loss/Surface	%	TBA
Neutron Capture Cross-section	barns	TBA

LuAG(Pr) Scintillation Crystals - Mechanical Properties

Property	Units	Value
Chemical Formula		LuAG(Pr)
Density	g/cm³	6.73
Atomic Number (Effective)		62.9
Melting Point	ºC	2043
Thermal Expansion Coeff.	C⁻¹	8.8 x 10⁻⁶
Cleavage Plane		None
Hardness	Mho	7.5
Hygroscopic		No
Solubility	g/100gH₂0	N/A

Sizes

Property	Value
Diameters	50 mm max.
Lengths	135 mm max.

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