Affiliation:
1. Military University of Technology , Warsaw , Poland
2. Central Laboratory for Radiological Protection , Konwaliowa 7 St. , Warsaw , Poland
Abstract
Abstract
The aim of the present research was to assess the radiological importance of the fly ashes generated from the incineration of sludge from the “Czajka” sewage treatment plant located in Warsaw, Poland. The γ-spectrometry technique was employed for their radiometry. The high purity germanium (HPGe) detector was mathematically energy-efficiency calibrated. The ash samples were measured two times, i.e., after 24 days and after 3 months of storage. Storage was supposed to provide a radioactive equilibrium. Radionuclides from three natural decay series, i.e., uranium–radium, uranium–actinium, and thorium, were detected in the ash samples. Apart from these, 40K, 137Cs, and 7Be were also detected. The indicated levels of radionuclides do not produce radioactive hazards, regardless of the method used for further management.
Reference8 articles.
1. Adsley, I., Backhouse, J. S., Nichols, A. L., & Toole, J. (1998). U-238 decay chain: Resolution of observed anomalies in the measured secular equilibrium between Th-234 and daughter Pa-234m. Appl. Radiat. Isot., 49 (9/11), 1337–1344. https://doi.org/10.1016/ S0969-8043(97)10070-7.
2. Singhal, R. K., Basu, H., Saha, S., Kumar, A., & Pimple, M. V. (2016). Estimation of 232Th concentration in environmental matrices by tracking activity of major daughter products (212Bi, 212Pb and 228Ac) with time in a hermetically sealed container. J. Environ. Anal. Chem., 3(4), 1000186. DOI: 10.4172/2380-2391.1000186.
3. De Corte, F., Umans, H., Vandenberghe, D., De Wispelaere, A., & Van Den Haute, P. (2005). Direct gamma-spectrometric measurement of the 226Ra 186.2 keV line for detecting 238U/226Ra disequilibrium in determining the environmental dose rate for the luminescence dating of sediments. Appl. Radiat. Isot., 63(5/6), 589–598. https://doi.org/10.1016/j. apradiso.2005.05.008.
4. Federal Ministry for the Environment, Nature Conservation and Consumer Protection. (2018). Procedures manual for monitoring of radioactive substances in the environment and of external radiation. Federal Office for Radiation Protection (BfS) & Physikalisch-Technische Bundesanstalt (PTB).
5. Decay Radiation Database. (2023, February). Nu-Dat3. [computer software]. National Nuclear Data Center. Retrieved February 21, 2023, from https:// www.nndc.bnl.gov/nudat3/help/dehelp.jsp.