Removal of Radioactive Gas by Zeolite Filter From Nuclear Power Plants

Yıl 2022, , 14 - 20, 30.06.2022

Ahmet Osmanlıoglu

https://doi.org/10.38061/idunas.844243

Öz

During the normal operation of nuclear power plants, some radioactive wastes are produced in the form of particles or aerosol gas in the reactor building. Particulate radioactive aerosols can be produced in a wide variety of particle sizes, possibly in combination with non-radioactive aerosols. Emission of corrosion products and fission products that are activated by the effect of nuclear rays generate aerosols from two sources. These; are created by the adsorption of gases generated by radioactive decay and volatile radionuclides formed during the fission process on the present suspended material. The most important volatile radionuclides that form the gaseous radioactive waste produced during the normal operation of nuclear power plants are halogens, noble gases, tritium, and carbon-14. The composition and amount of radioactivity present in the various airborne waste streams depend largely on the reactor type and release path. All gaseous waste from nuclear power plants must be treated before discharging into the atmosphere. In this paper, radioactive radon gas was used to represent the radioactive gases generated from nuclear power plants and natural zeolite was used as adsorbent material for radon removal. A series of experiments were conducted to measure the performance of the filter made in the zeolite. First of all, an approximate particle distribution size in the range of 1 to 3 mm was obtained by grinding natural zeolite. The ground material was then compressed in cylindrical adsorbent moulds of 35 mm diameter and 10 mm height. After the moulds were filled with the material, they were dried by heating to 110 ° C for 24 hours. At the end of the heat treatment, the adsorbent beds were cooled and connected to the test apparatus. RAD7 radon test device was used in the experiments. The RAD7 is a portable instrument that uses a solid-state alpha detector to measure radon gas concentrations in the range of 4.0-750,000 Bq / m3. The sampler of the RAD7 device works by drawing an air sample from an inlet filter into a 0.7 L sample cell covered with an electrical conductor. At the centre of the hemisphere, the cell is a planar silicon detector implanted with an ion to measure radioactivity. As result of the experiments, it shows that the zeolite filter absorbs 85% radioactive radon gas and can be used as an air filter in nuclear power plants.

Anahtar Kelimeler

Radioactive, Radon, Filter, Zeolite

Kaynakça

• Moghissi, A. A., Godbee, H. W., Hobart, S. A. (1986). Radioactive Waste Technology. The American Society of Mechanical Engineers, New York, NY.
• Jay, H. Lubin et.al. (1997). Estimating Lung Cancer Mortality from Residential Radon Using Data for Low Exposures of Miners. Radiation Research., vol. 147,126-134.
• Chau, N.D., Niewodniczański, J., Dorda, A., Ochoński, E., Chrusciel. I. (1997) Determination of radium isotopes in mine waters through alpha- and beta-activities measured by liquid scintillation spectrometry. Journal of Radioanalytical and Nuclear Chemistry., vol. 222, 69–74.
• Yuan, L., Geng, S., Mao, J. et al. (2019). Investigating the mitigation effects of radon progeny by composite radon removal device. J Radioanal Nucl Chem, 319, 204-205.