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Distribusi Radionuklida Alam Dalam Sampel Lingkungan Tanah, Air dan Tanaman Sekitar PLTU Rembang
INTISARI
Penelitian mengenai distribusi radionuklida alam sampel lingkungan tanah, air dan tamanan di sekitar PLTU Rembang telah dilakukan dengan tujuan untuk mengetahui konsentrasi aktivitas radionuklida alam, pola distribusi radioaktivitas lingkungan di sekitar PLTU Rembang dengan sampel tanah, air dan tanaman serta membandingkan nilai konsentrasi aktivitas radionuklida alam sampel tanah, air dan tanaman sekitar PLTU Rembang dengan Nilai Batas Radioaktivitas Lingkungan (NBRL) yang dicantumkan pada Perka Bapeten No 16 Tahun 2013 tentang Keselamatan Radiasi dalam Penyimpanan Technologically Enhacced Naturally Occuring Radioactivity Material. Metode analisis sampel menggunakan spektrometri gamma dengan detektor HPGe serta software Maestro 2 didasarkan atas SNI 1070.3-2009. Hasil perhitungan konsentrasi aktivitas radionuklida alam 226Ra, 228Ra, 232Th dan 40K pada sampel tanah sebesar (8,17×10-3 ± 2,33×10-4; 9,99×10-3 ± 1,69×10-4; 7,84×10-3 ± 2,78×10-4; 4,46×10-2 ± 6,78×10-4) Bq/g. Sampel air (3,07×10-3 ± 4,05×10-4; 3,59×10-3 ± 3,22×10-4; 6,59×10-4 ± 5,59×10-5; 2,82×10-2 ± 1,93×10-3) Bq/L. Sampel tanaman (1,69×10-3 ± 9,06×10-5; 7,56×10-4 ± 5,04×10-5; 4,13×10-4 ± 3,03×10-5; 1,17×10-2 ± 7,52×10-4) Bq/g. Pola distribusi konsentrasi aktivitas radionuklida alam yang yang terbentuk yaitu pada sampel tanah memiliki pola distribusi semakin jauh jarak dari PLTU Rembang semakin besar konsentrasi aktivitasnya. Selanjutnya, pada sampel air maupun tanaman pola distribusinya cenderung mengarah ke lokasi yang dekat dengan PLTU yang memiliki konsentrasi aktivitas lebih besar. Perbandingan konsentrasi aktivitas radionuklida alam dengan Nilai Batas Radioaktivitas Lingkungan (NBRL) menunjukkan keseluruhan konsentrasi aktivitas radionuklida alam di sampel tanah, air maupun tanaman di setiap lokasi pengambilan sampel masih belum melebihi Nilai Batas Radioaktivitas Lingkungan (NBRL) yang telah ditetapkan oleh Bapeten dalam Perka Bapeten No 16 Tahun 2013 tentang Keselamatan Radiasi dalam Penyimpanan Technologically Enhanched Naturally Occuring Radioactivity Material.
Kata kunci: Radionuklida alam, sampel lingkungan, PLTU Rembang, spektrometer gamma, radioaktivitas.
ABSTRACT
Research of the natural radionuclide distribution of soil, water and plant samples around Rembang Coal Fired Power Plant (CFPP) has been done with the purpose of the study is to know the activity concentration of natural radionuclide, the pattern of distribution of environtment radioactivity around Rembang CFPP with soil, water and plant samples and compare the activity concentration of natural radionuclide around Rembang CFPP with Environmental Radioactivity Limit Values (ERLV) which is listed on the Perka Bapeten No 16 of 2013 about Safety Radiation in Storage of Technologically Enhanched Naturally Occuring Radioactivity Material. Sample analysis method using gamma spectrometry with HPGe detector and Maestro 2 software is based on SNI 1070.3-2009. The calculated concentration of natural radionuclide activity 226Ra, 228Ra, 232Th dan 40K in soil sample is (8.17×10-3 ± 2.33×10-4; 9.99×10-3 ± 1.69×10-4; 7.84×10-3 ± 2.78×10-4; 4.46×10-2 ± 6.78×10-4) Bq/g. Water sample (3.07×10-3 ± 4.05×10-4; 3.59×10-3 ± 3.22×10-4; 6.59×10-4 ± 5.59×10-5; 2.82×10-2 ± 1.93×10-3) Bq/L. Plant sample (1.69×10-3 ± 9.06×10-5; 7.56×10-4 ± 5.04×10-5; 4.13×10-4 ± 3.03×10-5; 1.17×10-2 ± 7.52×10-4) Bq/g. The distribution pattern of the concentration of natural radionuclide activity that is formed that is in the soil sample has the distribution pattern of the distance from CFPP Rembang the bigger concentration activity. Furthermore, in water and plant samples the distribution pattern tends to lead to a location close to the CFPP that has a bigger concentration of activity. Comparison the concentration of natural radionuclide activity with Environmental Radioactivity Limit Values (ERLV) it was found that the overall concentration of natural radionuclide activity in soil, water or plant samples at each sampling site still did not exceed the Environmental Boundary Limit Radioactivity (ERLV) that defined by Perka Bapeten No 16 of 2013 about Safety Radiation in Storage of Technologically Enhanched Naturally Occuring Radioactivity Material.
Key words: Natural radionuclide, environment sample, Rembang CFPP, gamma spectrometry, radioactivity, distribution.
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