Productions

ISMA presents production of the institute. On this page one can find information about next positions
 
Alpha detectors are used for α-particle detection in radioecology and technological control.

Advantages ZnSe vs ZnS(Ag) power: no phosphorescence, lower afterglow
 
Scintillator  ZnSe (O,Al)
Production’s form  - powder (granule size is up to 15 mkm)
- one part paint
 - tiles of single crystal connected with light guide from polymethyl methacrylate (PMMA) 
MeasurementrRange of surface activity 239Pu  3.4∙10-3 – 3.4 103 Bk∙cm-2
Sensitivity to  239Pu     >0,15 cps/(particle∙min-1∙сm-2)
Energy range 2000-10000 keV
     
                                 
                                                


ZnSe(O,Al) vs ZnS(Ag)
 
Parameter ZnSe(Al,O) ZnS(Ag)
Morphology single crystal, polycrystalline powder polycrystalline powder
λmax, nm 590 450
Light yield, photon/MeV 70000 75000
Decay time, ns 1000 200
Afterglow, % (after 3 ms) 0.5 20.6
α/γ ratio 0.8 -
  

   
Alpha detectors are used for particle detection in radioecology and technological control.

Advantages: spectrometric for α and α/β separation, no phosphorescence large area production technology.
 
Scintillator ZnSe (O,Al)
Scintillator’s active area
- single crystal up to 2”
- “mosaic” design more than 2”
α/γ ratio (239Pu, 137Cs) 0.84
Registration efficiency (4π), 239Pu 35%
Sensitivity, pps∙Bq, 239Pu > 0,3
Sensitivity, pps∙Bq, 90Sr-90Y > 0,27
Minimum detecting activity, Bq, 239Pu < 0,02
Minimum detecting activity, Bq, 90Sr-90Y < 0,15
Energy range:
             Alpha 2000-10000 keV
             Beta 65-4000 keV
   

   
Advantages: low afterglow, high efficiency for x-ray energy.
 
Scintillator LO, % Afterglow, %
3 ms 5 ms 10 ms 20 ms 30 ms 100 ms 200 ms 500 ms
ZnSe fast 50 0.003 0.003 0.002 0.001 0.001 0.001 0.001 0.000
ZnSe standard 100 0.022 0.016 0.009 0.006 0.004 0.001 0.001 0.000
ZnSe flexible 40 0.085 0.071 0.051 0.041 0.035 0.021 0.014 0.008
GOS (Pr) fast 53 0.008 0.005 0.002
GOS (Pr) slow 53 0.08 0.02 0.01
CsI(Tl) 100 0.718 0.501 0.332 0.288 0.261 0.193 0.155 0.106


 
Zeff 33
Density, g/cm 35.27
Cleavage plane <100>
Hardness, Mhos 4
Hygroscopic No
Wavelength of emission max, nm 590
Lower wavelength cutoff, nm 460
Refractive index @ emission max 2.66
Effective average decay time for γ, μs 0.8
Light yield for γ, photon/keV 60
 





 

Gamma detectors for radiation portal monitors are used for gamma-energy registration from 15 KeV.

Advantages: cost efficient, high uniformity and low-gamma radiation sensitivity.
 
Scintillator         Polystyrened based
Cross size up to 2000 mm
Operating temperature – 40°C … +60°C
Wavelength (max emission) 418 nm
Decay time 2.4 ns
Light output 56%

 
scintillator size sensitivity, 1/sec*kBq
 
MDA,1/kBq
 
Cs137 Am241  Cs137 Am241
more than no more than
PS 50x500x1000 10 1,2 40 250
PS 50x250x1000 5 0,7 50 300
PS 50x406x1880 3 0,5 65 400
 
ISMA offers following polystyrene based scintillation materials:
 
 — Polystyrene based plastic scintillators UPS-923A
  • Wavelength (max emission), nm
418
  • Decay time, ns 
2, 3
  • Reflective index (@430 nm)
1.55
  • Light output, % of anthracene
56
 
— Wavelength shifting plastics
  • Wavelength (max emission), nm
from 425 to 530 (in accordance with customer's requirements)
 
— Radiation-hardness
  • Wavelength (max emission), nm
530
  • Decay time, ns
7
 
— Plastic scintillators for neutron-gamma discrimination UPS-113 NG
Wavelength (max emission), nm 418
Decay time, ns 2, 3
Reflective index (@430 nm) 1.55
Light output, % of anthracene 42
n/ϒ discrimination 1.8
 
— High temperature
  • Operating temperature
up to +120°C




BISMUTH GERMANATE Bi4Ge3O12 (BGO)
 
Transmission of BGO 3 mm thick


Scintillation and physical properties
Effective atomic number 74
Density, g/cm3 7.13
Melting point, К 1323
Radiation length, cm 1.12
Refractive index 2.15
Luminescence peak, nm 480
Hygroscopicity no
Decay time, ns 300
Light yield, ph/MeV 8000-10000
Light yield, % (Nal:TI) 15-20
Energy resolution (662 keV), % 10.0-11.5
Afterglow, % (after 3 ms ) 0,005
Radiation hardness, rad 105-106
 

High stopping power, high scintillation efficiency, good energy resolution, non-hygroscopicity and low cost made BGO the material of choice for high energy physics, nuclear physics, space physics, nuclear medicine, geological prospecting and other industries.
ISMA supplies high quality BGO crystal boules of up to 80 mm dia., or up to 400 mm long, as well as elements of various shapes.

 
BGO 60 mm dia.
 
Yttruim aluminium garnet Y3Al5O12:Ce (YAG:Ce) and  Lutetium Aluminum Garnet activated by cerium (Lu3Al5O12:Ce, LuAG:Ce), are fast and bright scintillation materials. The decay time is 70-100 ns. This is of advantage in time dependent and coincidence measurements. The wavelength of scintillation emission is about 530-550 nm, which is ideal for photodiode and avalanche diode readout. The materials can also be used for imaging screens. LuAG is a good alternative to dense and fast rare-earth orthosilicate scintillators (LSO:Ce, GSO:Ce, LYSO:Ce). The material is mechanically and chemically stable with no cleavage and hygroscopicity. The material can be machined into a variety of shapes and sizes including prisms, spheres and thin plates. Recently developed Gd3Al5-xGaxO12:Ce (GAGG:Ce) with the light yield up to 50000 phot/MeV are the brightest known oxide scintillators.

Scintillation and physical properties
  YAG:Ce LuAG:Ce GAGG:Ce
Crystal size available up to 45 mm dia. and 150 mm length
Crystal structure cubic
Cleavage no
Hygroscopicity no
Light yield, ph/Mev 30000 15000 45000
Hardness, Mhos —  8.5 — 
Emission 540 nm 535 nm 510-530 nm
Density, g/cm3 4.55 6.7 6.6
Refraction index ~ 1.8 ~ 1.8 ~ 1.8
Primary decay time, ns 100 70 100-150
 
Advantages
- Very high light yield (GAGG:Ce);
- High density (LuAG:Ce, GAGG:Ce);
- Good matching for photodiode and avalanche diode readout;
- Very good machining properties;
- Fast decay.
Main usage

- High energy gamma and charged particle detection;
- PET matrices;
- High spatial resolution imaging screens for X-rays, gamma and beta.
 
 

 
​​​​​​STRONTIUM IODINE SrI2:Eu CRYSTALS AND DETECTORS
 
Scintillation and physical properties
Effective atomic number 48 SrI2:Eu is one of the most efficient scintillators with excellent light yield and energy resolution. The energy resolution up to 3.2 % at 662 keV makes this scintillator very efficient for spectroscopic determination of nuclear isotopes. We offer both naked crystals,
and their encapsulation preventing oxidation at open air.
Density, g/cm3 4.55
Melting point, °C ~600
Radiation length, cm 1.95
Refractive index 1.85
Luminescence peak, nm 435
Hygroscopicity yes
Decay time ~1 µs
Light yield, ph/MeV 80000
Energy resolution (662 keV), % up to 3.2
Emission range, nm 400-800
Non-proportionality of light yield in the 20-1500 keV range <10%
 

25 dia. x 35 mm element

25 mm dia. x 25 mm dia. elements

Naked and encapsulated 6x6x6 element

Encapsulated 25 mm dia. 25 mm elements