Outside the EAST experimental hall in a laboratory is where you may find the gamma spectrometer. The concrete wall of the hall is 1.5 m thick, with a collimator (4 cm in diameter) perpendicular to the plasma on the equatorial plane. The wall's thickness allows the spectrometer to operate in optimal measuring circumstances. To prevent potential neutrons from entering the detector, a neutron attenuator is employed. Located inside the collimator, the neutron attenuator is composed of polythene.