http://nopr.niscair.res.in/handle/123456789/9723 <b>Special Issue on Accelerators and Low Level Radiation Safety — Part 1</b> Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/9915 Title: Natural radioactivity in Udupi and Karkala Taluks of coastal Karnataka <br/> <br/>Authors: Pinto, Gerald; Karunakara, N; Somashekarappa, H M; Rao, Chetan; Prabhu, Ujwal; Yashodhara, I <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region" downloadurl="http://www.5iantlavalamp.com/"> The gamma radiation levels, ²²⁶Ra, ²³²Th and ⁴⁰K concentrations in soils of Udupi and Karkala Taluks of coastal Karnataka region of India have been studied in the present paper. The gamma absorbed dose rates were measured using portable GM survey meter. The soil radioactivity was measured by gamma spectrometry method using an HPGe detector. The results show that the ²²⁶Ra concentration varies in the range 2.6-78.0 Bq kg^-1 with a mean of 34.4 Bq kg^-1, ²³²Th in the range 2.3-166.2 Bq kg^-1 with a mean of 45.3 Bq kg^-1 and ⁴⁰K in the range 72.9-493.5 Bq kg^-1 with a mean of 198.6 Bq kg^-1in the 0-5 cm soil profile. The gamma absorbed dose rates, measured using the GM survey meter, show that the dose varies in the range 70.0-123.0 nGy h^-1. The regression analyses performed between the measured dose rates and that calculated from the primordial radionuclide activities show a poor correlation between the measured and calculated dose. </smarttagtype></smarttagtype> <br/> <br/>Page(s): 527-529 http://nopr.niscair.res.in/handle/123456789/9914 Title: Synthesis of conducting polymers and their characterization <br/> <br/>Authors: Monika; Kumar, Rajesh; Chauhan, R P; Kumar, R; Chakarvarti, S K <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="City" downloadurl="http://www.5iamas-microsoft-com:office:smarttags"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region" downloadurl="http://www.5iantlavalamp.com/"> Nanostructures of conducting polymer (polypyrrole) have been fabricated by chemical synthesis using non-galvanic method within the pores of polycarbonate membrane. Polycarbonate (Makrofol KG) foil of thickness 10 mm and diameter 100 nm having flux 10⁵/cm² purchased from Whatman, UK has been used as template for the fabrication of polypyrrole nanostructures. The morphology of the structures has been studied by scanning electron microscope (SEM). </smarttagtype></smarttagtype></smarttagtype> <br/> <br/>Page(s): 524-526 http://nopr.niscair.res.in/handle/123456789/9913 Title: Measurement of radon activity, exhalation rate and radiation doses in fly ash samples from NTPC Dadri, India <br/> <br/>Authors: Gupta, Mamta; Mahur, A K; Sonkawade, R G; Verma, K D; Prasad, Rajendra <br/> <br/>Abstract: Radon activities and radon exhalation rates have been measured in fly ash samples from NTPC (National Thermal Power Corporation), Dadri situated in Uttar Pradesh, using “Can technique”. This technique employs LR-115 type II solid state nuclear track detectors fixed at the top of the “Can” filled with fly ash samples. Radon activity has been found to vary from (222.56 ± 25.8) to (673.68 ± 45.1) Bqm^-3 with an average value of (431.71 ± 35.5) Bqm^-3. Surface exhalation rate has been found to vary from (80 ± 9) to (243 ± 16) mBqm^-2h^-1 with an average value (155 ± 13) mBqm^-2h^-1, whereas mass exhalation rate has been found to vary from (3.1 ± 0.4) to (9.34 ± 0.6) mBq kg^-1h^-1 with an average value of (5.98 ± 0.5) mBqkg^-1h^-1. Indoor inhalation exposure (radon) effective dose has also been estimated which is found to vary from (5.8 ± 0.7) to (17.6 ± 1.2) <img src='/image/spc_char/micro.gif'> Svy^-1 with an average value of (11.3 ± 0.9) <img src='/image/spc_char/micro.gif'> Svy^-1. <br/> <br/>Page(s): 520-523 http://nopr.niscair.res.in/handle/123456789/9912 Title: Phytoremediation of ¹³⁷Cs from low level nuclear waste using <i>Catharanthus roseus</i> <br/> <br/>Authors: Fulekar, M H; Singh, Anamika; Thorat, Vidya; Kaushik, C P; Eapen, Susan <br/> <br/>Abstract: Remediation of radionuclides has been carried out using the phytoremediation technology. The green plants have been screened for the uptake potential of radionuclide and found that <i style="">Catharanthus roseus</i> has the high potential for radionuclides in particular ¹³⁷Cs. Low level nuclear waste (LLNW) collected from effluent treatment plant, BARC has been characterized for physico-chemical and the presence of traces of radionuclides. LLNW was spiked with 3.7×10⁴kBqL^-¹ activity level of ¹³⁷Cs. The plants of <i style="">C. roseus</i> were grown in (i) LLNW, (ii) ¹³⁷Cs spiked LLNW and (iii) with the control. The radio activities were measured in the solution at the intervals of 0, 1, 2, 3, 6, 8 and 15 days in triplicate set of the experiment. The plants were harvested after the growth. The depletion of ¹³⁷Cs in LLNW was found to be 19, 21, 24, 38, 60 and 76% at intervals of 1, 2, 3, 6, 8 and 15 days, respectively. The bio-accumulation of ¹³⁷Cs has been measured in the roots and shoots of the harvested plants. The activity of ¹³⁷Cs was found higher in shoots (998 kBq g^-1 dw) as compared to the roots (735 kBq&nbsp;g^-1 dw). The uptake of radionuclide-¹³⁷Cs, bio-accumulation in the shoot via the active transport from the root, shows the high efficiency and potentiality of <i style="">C. roseus</i> for the remediation of radionuclide. The bio-accumulation of ¹³⁷Cs in the shoot will remediate the radionuclide contamination from LLNW. <i style="">C. roseus</i> can also be made applicable for effective remediation of radionuclides present in the LLNW. <br/> <br/>Page(s): 516-519