The Simple Scintillation Spectrometer (SSS) is a neutron spectrometer intended to complement the spectral range of ROSPEC allowing measurements from 4 to 16 MeV. The SSS detector elements are an array of small plastic scintillators coupled to a photomultiplier tube. The dimensions of these scintillators are selected to optimise the neutron response functions of the detector while at the same time minimising the sensitivity to gamma radiation.

The physical appearance of the SSS is very similar to the portable gamma spectrometer made by BTI (MICROSPEC), consisting of two parts: a probe containing the neutron detector and its photomultiplier, light pulser, and high voltage supply; and an analyzer module which includes a shaping amplifier, analog-to-digital converter, display, keyboard, and system power supply.

Like ROSPEC, the SSS produces raw data which is, to a first approximation, the integral of the neutron spectrum. This data is input to the standard ROSPEC program to generate spectra and dosimetry up to 16 MeV.