Productions


 ALPHA DETECTORS ZnSe BASED
 
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/BETA DETECTORS
 
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
   
               
ZnSe (O,Al) SCINTILLATION CRYSTALS FOR X-RAY
 
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
 




POLYSTYRENE BASED SCINTILLATION DETECTORS
 
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
 


 
POLYSTYRENE BASED PLASTIC SCINTILLATION MATERIALS
 
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