Precence of hafnium is  more  than 100 mg/kg making it impossible to use as cladding material in nuclear reactor, because of its high adsorption cross section thus inhibite the nuclear fission. The objective of this research is to separate Zr – Hf using SIR method that is by impregrnating extracts to  resin. Extractants used are TBP and D2EHPA, resin used is XAD – 7, and feed used is Zirconium Basic Sulphate (ZBS). In this research is done variation compotition SIR, optimation process adsorption and desoprtion SIR and determintionof equation model in adsorption SIR. The result of this research is composition SIR the most effective for separation Zr – Hf is 5 : 5 for dry method’s and 7 : 3 for wet metode’s, model of equation for Zr nearly Langmuir model, model of equation for Hf nearly Freundlich model and adsorption result effenctively is comparation feed : SIR yaitu 10 mL : 1,5 g (1 : 1,5) with separation factor 30.12 ; separation efficiency Zr 31.47 % and separation efficiency Hf  42.06%.

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Air radioactivity monitoring was carried out using a continuoust air radioactivity monitoring device, namely the SMARTCAM device, each of which was installed in the chimney of the Radiometallurgical Installation (RMI) Building and then an evaluation of the air radioactivity data was carried out every month during 2020. The purpose of this research about air monitoring was to determine the radioactivity and release from the IRM chimney to the environment during 2020. The data taken are gross alpha (α) and gross beta (β )concentrations at the RMI. The data that has been obtained is then processed to find the daily average value, then the highest average value is taken in one month. The results obtained for each month are then compared with Maximum Permissible Concentration (MPC) for the predetermined gross α and gross β. The results of data evaluation is shown that the air radioactivity monitoring during 2020 at IRM is 0.324 Bq/m3 for alpha and 6.342 Bq/m3 for beta . The amount of air radioactivity of IRM in 2020 when compared to the MPC of 2 Bq/m3 for alpha and 20 Bq/m3 for beta, the air radioactivity is still far below the maximum allowable limit, from these results it can be said that the radioactive gas/aerosol effluent released from the IRM chimney during 2020 did not cause radiological impacts and was safe for the community and the environment around the IRM building.

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