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Rexon - Model RP-200 -Plastic Scintillators
Plastic Scintillators offer high performance, ease of handling , mechanical stability at a relatively Low Cost when compared to Inorganic Scintillators such as NaI(TI). The versatility of plastic scintillators makes them the ideal choice for large area and specially shaped detectors. In particular, The composition formula for RP-200 dates back to the early 1970s and has been modified to provide the lowest Cost Plastic Scintillator available where timing is a secondary issue concomitant with as good an Efficiency as the RP-408 and RP-400.
RP-200 combines two important properties:
- Lowest Cost Scintillator Type with the SAME COUNTING EFFICIENCY.
- Long Optical Attenuation Length - Typical measurements of 4 meter optical attenuation length are achieved in strips ofcast sheet in which a representative size is 2 cm x 20 cm x 300 cm.
The emission spectrum ( 435 nm) is well matched to common photomultipliers. RP-200 is the detector of choice for many industrialapplications such as in gauging and environmental protection where high sensitivity of signal uniformity are critical operating requirements. Commercially, it is the most preferred Economy Plastic Scintillator in use. Refer to Plastic Scintillator General Information for thecomplete line of Rexon Plastic Scintillators or Call for data sheet.
GENERAL PROPERTIES
- Polymer Base: Polvinyltoluene
- Density , g/cc: 1.02
- Refractive Index: (ND): 1.58
- Softening Point: 70 oC
- Coeff. of Linear Expansion:: 7.8x10-5 Below +67oC
- Vapor Pressure: Negligible. May be used in high vacuum.
- Light Output vs Temperature: At +60oC is 95% of thatat +20oC.- No change from +20oC to -60oC.
- Radiation Length: 43cm
SCINTILLATION PROPERTIES
- Light Output , % Anthracene : 38
- Scintillation Efficiency, Photons/ MeV: 9,200
- Wavelength of Max. Emission, nm: 435
- Rise Time, ns: 1.0
- Decay Time, ns: 3.3
- Pulse Width, FWHM, ns: 4.2
- Atomic Ratio, H/C: 1.10
- No. of H Atoms per cm3, x 1022 : 5.17
- No. of C Atoms per cm3, x 1022 : 4.69
- No. of Electrons per cm3, x 1022 : 3.33