On the first day of the activity, initial coordination was carried out at the Pertamina Regional 3 Zone 9 office in Balikpapan City. The study team, consisting of Khoirul Huda as team leader, accompanied by Tino Sawaldi Adi Nugroho and E.H. Riyadi as team members, was received by representatives from Pertamina Regional 3 Zone 9, namely Dr. Harry Djokohoetarjo Hoerip (Assistant Manager Health), Ahmad Zuhal Fachri (Assistant Manager Environment), and Mahadewi Mustika Putri (Assistant Occupational Health and Industrial Hygiene). The head of the study team, Khoirul, during the entry meeting, conveyed the purpose of the activity, namely to conduct radiation baseline mapping at oil and gas exploration and production facilities, especially at points where scale and sludge are estimated to accumulate, which, based on the International Atomic Energy Agency (IAEA) reference, are materials that have the potential to contain NORM in oil and gas exploration and production activities.

The radiation baseline mapping activity began at Pertamina EP Sanga-Sanga, located in Sanga-Sanga, Kutai Kertanegara, then continued to Pertamina Hulu Sanga-Sanga, located in Muara Badak, Kutai Kertanegara. The last radiation baseline mapping activity was carried out at Pertamina EP Sangatta, located in South Sangatta, East Kutai.

Radiation baseline mapping from NORM was conducted in the oil and gas production area, namely the Main Gathering Station and the export pipeline (Export Manifold). In addition, radiation baseline measurements and scale sampling were also conducted on used oil and gas exploration and production pipes at the used pipe storage location. [Ryd/P2STPIBN/BHKK/GP]