Plastic Scintillators

Selector guide for plastic scintillator   Physical Properties of Plastic Scintillators

Detector Nomenclature Guide Plastic scintillators are a solid solution of luminophors (luminescent additives), in a transparent polymer (polystyrene (PST).

Many characteristics of plastic scintillation materials (light output, transparency to own emission, decay time, radiation resistance) can be varied by changing their composition.

Polystyrene-based scintillators
Scintillators with a polystyrene matrix are used to detect alfa-, beta, and gamma- radiation, and fast neutrons.

 Plastic scintillators are prepared by bulk polymerization in aluminium (size up to 3.5 m) or glass cast and by pressure molding technique.

By varying the composition, we can produce:

  • fast plastic scintillation material: decay time from 0.9 to 0.5 ns, light output 55-50% of anthracene;
  • plastic scintillation material having the slow decay component: decay time from 300 to 400 ns, light output 45-40% of anthracene;
  • radiation hard plastics (UPS-92RH with dia.16x10 ́́ has 50 % of the initial light output after irradiation at 18 ̀Rad);
  • plastic scintillation material of elevated radiation resistance:
  • scintillation polystyrene with the light scattering additive;
  • scintillation material for dosimetry;
  • scintillation polystyrene containing soluted organic compounds of heavy elements (Pb -12%, Sn -10%).
Polystyrene (PST)
 Density [g/cm3] 1.06
 Refractive index 1.06
 Absorption coefficient [cm-1] 0.01-0.003
 Softening temperature [K] 355-360
 Hygroscopic no
 Wavelength of emission maximum [nm] 430
 Light output [% of anthracene] 56
 H/C ratio 1.0
 Decay time [ns] 2-3

 

Selector guide for plastic scintillator.  

Scintillator

Important property

Application comments

UPS-89, UPS-923A, UPS-90, UPS-96

Very high light output, good transparency, short decay time

General purpose, particle detection

UPS-92S

Slow decay time

Phoswiches

UPS-91F

Ultra fast decay time

High energy physics, calorimetry

UPS-92RH

Radiation hard

High energy physics, calorimetry

UPS-96M

Pressure molding technique, very cheap

High energy physics, calorimetry

UPS-976, UPS-971, UPS-972, UPS-973, UPS-974

Various wavelengths of maximum emission

Operation with fiber shifters

 

Physical Properties of Plastic Scintillators  

Scintillator

Light output % anthracene

Wavelength of max. emiss., nm

Rise time, ns

Decay time, ns

Light attenuation length, nm

Analoges

UPS-89

65

418

0.9

2.4

360

NE102A

UPS-923A

60

425

0.9

3.3

400

BC400, NE114

UPS-90

50

418

1.0

3.5

400

NE110

UPS-92S

44

380

0.9

380-450

350

BC412, NE115

UPS-91F

39-45

390

0.7

0.6-0.4

PilotV, BC422Q

UPS-92RH

60

425

3.5

350

SCSN81

UPS-96M

55

418

1.0

3.5

25

none

UPS-97G

60

425

0.9

3.3

60

BC444

UPS-971

55

425

0.9


400

none

UPS-972

44

435

0.9


400

none

UPS-973

45

445

0.9


400

none

UPS-974

53

480

0.9


400

none

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