The M600 is a novel plastic scintillator material for gamma and neutron spectrometry in harsh environments. In contrast to other solid organic scintillators, it is based on a polyurethane matrix complemented with scintillating and wavelength-shifting additives.

Its main advantages are a better mechanical stability and a radical reduction of aging effects as fogging, combined with increased absorption of gamma radiation due to slight elevations of density and effective atomic charge number, and the possibility to distinguish neutron and gamma interactions via pulse-shape discrimination (PSD).

The emission spectrum peaks at 430 nm and is well matched with the spectral sensitivity of common photomultiplier tubes (PMT). The neutron-gamma discrimination performance of the M600 plastic scintillator is competitive with that of other commercial materials.

PROPERTIES M600 Standard Plastic Scintillator
Light Output (% Anthracene) 55 60
Wavelength of Maximum Emission (nm) 430 425
H Atoms per cm3 (×1022) 5.69 5.17
N Atoms per cm3 (×1022) 0.4 0
O Atoms per cm3 (×1022) 0.85 0
Density (g/cm3) 1.207 1.023
Polymer Base Polyurethane Polyvinyltoluene
Refractive Index 1.57 1.58
Softening Point 72 °C 75 °C
Shore “D” Hardness 86 84