During a tokamak disruption, the sudden loss of relativistic electrons (RE) can lead to severe damage to plasma-facing components, emphasising the need for mitigation strategies to ensure device safety. To investigate the formation and safe termination of RE beams in TCV, two main gas injections are performed. The first injection is a medium-Z gas to trigger a disruption and form a RE beam, and the second is a low-Z injection to increase the neutral pressure and recombine the companion plasma. This project aims to study the particle balance evolution during benign termination discharges in TCV and its impact on the neutral pressure requirements for the recombination of the companion plasma.