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Gamma heating is an important issue in the operation of research reactors and its irradiation facilities. Gamma energy deposition produced by each fuel type in the research reactor will have different values and characteristics. Uranium molybdenum (UMo) is a candidate fuel for research reactors in the future because it has several advantages than uranium oxide (UO2) or silicide (US) types. For this reason, the gamma heating calculation of RSG-GAS Molybdenum core was studied using GAMSET code. The calculation were compared with the results of the gamma heating validation of measurements and calculations of Silicide core. Gamma heating measurements were carried out at the Central Irradiation Position (CIP) of the RSG-GAS core using gamma calorimeter with absorber material of graphite (C), aluminum (Al), iron (Fe), and zirconium (Zr) elements. The measured and calculated results show that the gamma heating value in US fuel base in the range of 2.2 - 5.09 W/g. In general, the calculation results for the UMo fuel based are lower than US fuel based with a value of less than 2 W/g. This justifies that the UMo fuel based is better from the gamma heating aspect and the required cooling capacity. The calculation results in Molybdenum core showed that the increase in the level of uranium loading has an impact in gamma heating decrease. [ABSTRACT FROM AUTHOR]