Passive Radiation Detection Using TLD in NSRRC

The NSRRC is a research facility and currently op-erates two synchrotron accelerators: the Taiwan Light Source (TLS), featuring a beam energy of 1.5 GeV and a circumference of 120 meters, and the Taiwan Photon Source (TPS), with a beam energy of 3 GeV and a cir-cumference of 518.4 meters. There are hundreds of users in 40 beamlines among TPS and TLS experi-mental floors. The Thermo-Luminescent Dosimeter (TLD) is a compact instrument utilizing well-established detec-tion technology. To ensure radiation intensity at NSRRC workplace as close to background radiation levels as possible, we have deployed approximately 200 TLDs among these two accelerators. For each BL, three points are selected: the optical hutch near accel-erator shielding wall, the user experimental area with the highest occupancy, and the BL rear end. Additional TLDs are strategically placed around the accelerator's surroundings, including both the outer and inner sur-face of the shielding tunnel, downstream of the injec-tion section, the roof and downstream area of the RF cavities. In this paper, we will present the detection data col-lected at NSRRC over the past several years to reflect the proficiency of our radiation protection program.