Rexon - Model RP-408 -Plastic Scintillators

RP-408 combines two important properties:

• Relatively Fast Decay (2.1 ns) - useful for time-of-flight systems where timing is critical, and
• Long Optical Attenuation Length - Typical measurements of 4 meter optical attenuation length are achieved in strips
• of cast sheet in which a representative size is 2 cm x 20 cm x 300 cm.

The emission spectrum (425 nm) is well matched to common photomultipliers. RP-408 is the detector of choice for many industrialapplication such as in gauging and environmental protection where high sensitivity of signal uniformity are critical operating requirements. Commercially, it is the most preferred Plastic Scintillator in use.

Effects of liquids
 
The plastic scintillators are soluble in aromatic solvents, acetone chlorinated solvents etc. They are unaffected by water , dilute
acids, alkalis, lower alcohols, pure methyl alcohol, silicone grease or fluid.
 
Standard Sizes and Shapes
 
Sheet Sizes range up to 200" (5m) long by 36" (914mm) wide. blocks are available up to 96" (2.5m) long while Rods up to
48" (1220mm diameter are manufactured. Call for standard sizes of annuli, well counters, thin films and spheres.
 
Handlingandcleaning
 
Plastic scintillators sheets are supplied with a protective paper that should not be removed until ready for use. It is advisable to
handle all plastic scintillators with cotton or terylene gloves. If the scintillator requires cleaning we recommend a dilute solution of
liquiddetergent and a Selvyt polishing cloth or BPC grade cotton wool. Alternatively, We can supply  excellent cleaning and
polishing solutions. Use of this can often increase the measured light attenuation length. Ethanol or methanol may be used.
Machining instructions are available upon request.

GENERAL PROPERTIES

• Polymer Base: Polvinyltoluene
• Density , g/cc:1.032
• Refractive Index: (ND): 1.58
• Softening Point:70oC
• Coeff. of Linear Expansion: (Vapor Pressure: Negligible. May be used in high vacuum.
• Light Output vs Temperature:Independent of temperature
• from -60oCto +20oC. At +60oC is 95% of that at+20oC
• Radiation Length: 43cm

SCINTILLATION PROPERTIES

• Light Output, % Anthracene : 64
• Scintillation Efficiency,Photons/ MeV: 10,000
• Wavelength of Max. Emission, nm:425
• Rise Time,ns:0.9
• Decay Time, ns:2.1
• PulseWidth, FWHM, ns:.2.5
• Atomic Ratio, H/C:1.10
• No. ofHAtoms per cm3, x 1022 : 5.23
• No. ofCAtoms per cm3, x 1022 : 4.74