Assessment of the Activity concentrations of the naturally occurring radionuclides from the samples collected from the different (CUFL & JFL) Urea Fertilizer Company Limited

2017 ◽  
Vol 7 (3) ◽  
pp. 25-29
Keyword(s):  
Urea Fertilizer ◽  
Naturally Occurring ◽  
Activity Concentrations ◽  
Company Limited ◽  
Naturally Occurring Radionuclides

Activity Concentrations of Natural Radionuclides in Soils of Rainforest Sites in Western Ghats

2015 ◽  
Vol 2 (3) ◽  
pp. 103-108 ◽  
Author(s):  
P. K. Manigandan ◽  
K K Natrajan
Keyword(s):  
Western Ghats ◽  
Natural Radionuclides ◽  
Gamma Dose ◽  
Radiological Protection ◽  
Dose Rates ◽  
Naturally Occurring ◽  
Gamma Dose Rates ◽  
Activity Concentrations ◽  
Naturally Occurring Radionuclides ◽  
Radiological Hazard Indices

Assessments of naturally occurring radionuclides in soil collected from a tropical rainforest forest of western Ghats, India were conducted. These radionuclides were distributed unevenly in the forest soil. For all soil samples, the terrestrial gamma dose rate and the corresponding outdoor annual effective dose equivalents were evaluated. The activity concentration of 232Th and average outdoor gamma dose rates were found to be higher than the global average which appears to affects Western Ghats environment in general, the radiological hazard indices were found to be within the International Commission on Radiological Protection recommended limits. Hence, obtained results for natural radionuclides in the forest soils were within the range specified by UNSCEAR (2000) report for virgin soils except 232Th.

Exemption Levels for the Recycling and Disposal of Residues With Enhanced Levels of Natural Radioactivity (TENORM) in Germany

2001 ◽  
Author(s):  
R. Barthel ◽  
W. Goldammer ◽  
M. Helming
Keyword(s):  
Radiation Exposure ◽  
Radiation Protection ◽  
The Public ◽  
Naturally Occurring ◽  
Activity Concentrations ◽  
Measurement Strategy ◽  
Naturally Occurring Radionuclides ◽  
Disposal Options ◽  
Mining Residues ◽  
Adequate Measurement

Abstract The new German Radiation Protection Ordinance contains for the first time a systematic framework of regulations protecting workers and the public against radiation exposures from residues of industrial and mining processes containing enhanced levels of naturally occurring radionuclides (TENORM). These regulations will satisfy the requirements of the European Council Directive 96/29/EURATOM and serve as a common basis for the radiation protection activities of the German states in this field. The consideration of exposures from materials containing naturally occurring radionuclides gains on this basis an increased level of significance within the German radiation protection efforts. The overall goal of the new regulations is to keep the additional effective dose for the population from the recycling and disposal of TENORM below 1 mSv/a. In order to achieve this objective, companies in which such residues arise have to carry out representative measurements of activity concentrations in these materials. If exemption levels defined in the new regulations are exceeded, restrictions on the recycling and disposal come into effect. These exemption levels are nuclide specific and distinguish between material types and different recycling and disposal options. This specific definition of exemption criteria serves the goal to minimise the number of companies and the amount of residues affected by the new regulations to the extent possible, focussing the efforts of operators and regulators to those materials having the potential to actually cause radiation exposure problems. The specific exemption criteria were derived on the basis of an analysis of typical amounts and activity concentrations of industrial and mining residues with enhanced radioactivity contents in Germany. In a second step, practically applied options for the recycling and disposal of these materials were investigated. On this basis, generic scenarios for the radiation exposure of the workforce and the public were defined and doses were estimated. All relevant pathways including possible long term effects (ground water) were considered in these analyses. Based on the 1 mSv/a criterion, a catalogue of relevant materials, potentially requiring radiation protection measures, was developed. For these materials the practically applied recycling or disposal options were grouped into categories, for which specific exemption levels were derived. The derivation of these criteria was based on realistic estimates of radiation exposure, for example taking into account the dilution of the residues with other materials in technological processes or during the disposal in landfills. The residues subject to the new regulations mostly arise in large quantities over extended periods of time. This leads to significant variations of radionuclide concentrations depending on feed materials and process parameters. To carry out representative measurements without the necessity of taking a too large number of samples, therefore, requires an adequate measurement strategy. Particular aspects to be considered are uncertainties of the measurements themselves and the heterogeneity of the residues. In addition, the measurement strategy has to be compatible with diverse situations in the different industries affected. The framework developed for designing individual strategies for the various industries and types of residues satisfies these requirements and can also provide guidance for measurement campaigns in other areas. The paper outlines the general situation with regard to TENORM in Germany. The main streams of residues and options for their recycling or disposal are described. On this basis, scenarios used for the radiological evaluation are defined and examples for resulting radiation exposures are given. The exemption levels derived from this analysis are discussed. Finally, the framework for the design and implementation of an adequate measurement strategy is outlined.

ASSESSMENT OF NATURALLY OCCURRING RADIONUCLIDES IN MALAYSIA’S BUILDING MATERIALS

2019 ◽  
Vol 186 (4) ◽  
pp. 520-523 ◽  
Author(s):  
Shittu Abdullahi ◽  
Aznan Fazli Ismail ◽  
Supian Samat
Keyword(s):  
Hpge Detector ◽  
Building Materials ◽  
Activity Concentration ◽  
Natural Radionuclides ◽  
Naturally Occurring ◽  
High Purity Germanium ◽  
Activity Concentrations ◽  
Naturally Occurring Radionuclides ◽  
Measured Activity ◽  
Materials Used

Abstract The activity concentrations of 226Ra, 232Th and 40K radionuclides from common building materials used by Malaysian people for construction purposes were studied using High-Purity Germanium (HPGe) detector. The measured activity concentrations of the aforementioned radionuclides range from 10 ± 1 Bq kg−1 (limestone) to 155 ± 61 Bq kg−1 (feldspar), 12 ± 3 Bq kg−1 (limestone) to 274 ± 8 Bq kg−1 (kaolin) and 62 ± 19 Bq kg−1 (limestone) to 1114 ± 20 Bq kg−1 (pottery stone) for 226Ra, 232Th and 40K, respectively. The measured activity concentrations of the natural radionuclides reported herein were found to be in accordance with other previous studies. In general, the activity concentration of the natural radionuclides revealed that all the determined values were below the recommended limit.

scholarly journals Radon, gamma-ray exposure and natural radionuclides

2011 ◽  
Vol 1 (1) ◽  
pp. 285-287
Author(s):  
P. Wanabongse ◽  
W. Thorarit ◽  
N. Yimchalam ◽  
S. Bovornkitti
Keyword(s):  
Gamma Ray ◽  
Indoor Radon ◽  
Natural Radionuclides ◽  
Radon Exposure ◽  
Dose Rates ◽  
Naturally Occurring ◽  
Gamma Dose Rates ◽  
Activity Concentrations ◽  
Naturally Occurring Radionuclides ◽  
Exposure Levels

Abstract Measurements were conducted to determine residential radon exposure levels in provinces with high lung cancer incidence in three different regions of Thailand. The measurements revealed that the average indoor radon levels were 20.0, 24.4, and 13.1 Bq m−3, and that the average gamma dose rates were 145, 164, and 54 nSv h−1 in Chiangmai, Songkhla and Khonkaen provinces, respectively. The spectroscopic analysis of soil samples collected from the three provinces showed that the highest contents of Ra-226, Th-232, and K-40 were present in Songkhla, with values of 93.7, 71.9, and 786.9 Bq kg−1, respectively, and the lowest contents were present in Khonkaen, with values of 15.6, 19.0, and 46.8 Bq kg−1, respectively. The results of our analysis of the activity concentrations of naturally occurring radionuclides helped explain the lower levels of radon gas and gamma-ray exposure in Khonkaen.

scholarly journals Concentration ratios of 238U and 226Ra for insects and amphibians living in the vicinity of the closed uranium mine at Ningyo-toge, Japan

2020 ◽  
Vol 61 (2) ◽  
pp. 207-213
Author(s):  
Akihiro Sakoda ◽  
Shoichi Murakami ◽  
Yuu Ishimori ◽  
Sawako Horai
Keyword(s):  
Surrogate Data ◽  
Freshwater Ecosystems ◽  
Uranium Mine ◽  
Tailings Pond ◽  
Naturally Occurring ◽  
Activity Concentrations ◽  
Mill Tailings ◽  
Naturally Occurring Radionuclides ◽  
First Time ◽  
Concentration Ratios

Abstract There is still a scarcity of data on the transfer of naturally occurring radionuclides to wildlife in various ecosystems. In the present study, concentration ratios (CRwo-media) of 238U and 226Ra were obtained for grasshoppers, frogs and newts in terrestrial and freshwater ecosystems. Soil, water and animal samples were collected for 2 years in the vicinity of the closed uranium mine at Ningyo-toge, Japan. Three sites with different 238U and 226Ra levels were of interest: (i) pond and its shore (PO); (ii) low-level stream and its shore near overburden dump (OD); and (iii) uranium mill tailings pond and its shore (MP). The activity concentrations in both soil and water were PO ≈ OD < MP for 238U, and PO < OD < MP for 226Ra. Regarding the wildlife, 238U was able to be determined for all samples, but the detection of 226Ra was observed only for part of the samples. The means and standard deviations of CRwo-soil or CRwo-water were then calculated and may indicate the insignificant dependence of CRwo-media on environmental conditions characterized by the tested sites. The present data on CRwo-media were compared to the corresponding data or surrogate data from the IAEA’s database, showing both agreement and discrepancy. Our data contribute to enhancing the available data for those radionuclides and animals. In particular, the transfer to amphibians, one of the main links in common food webs, is reported here for the first time.

BASELINE EVALUATION STUDY OF NATURALLY OCCURRING RADIONUCLIDES IN SOIL SAMPLES FROM VICINITY OF INDIA’S FIRST FAST REACTOR FUEL CYCLE FACILITY (FRFCF), DAE COMPLEX, KALPAKKAM, INDIA

2018 ◽  
Vol 185 (1) ◽  
pp. 87-95 ◽  
Author(s):  
S N Bramha ◽  
H Krishnan ◽  
V Subramanian ◽  
R Baskaran ◽  
B Venkatraman
Keyword(s):  
Fast Reactor ◽  
Gamma Ray ◽  
Fuel Cycle ◽  
Soil Samples ◽  
Reactor Fuel ◽  
Gamma Ray Spectrometry ◽  
Naturally Occurring ◽  
Activity Concentrations ◽  
Naturally Occurring Radionuclides ◽  
Fast Reactor Fuel

Abstract The activity concentration of 238U, 232Th and 40K were measured in the soil samples collected from Fast Reactor Fuel Cycle Facility (FRFCF) site, using high-resolution gamma-ray spectrometry. This study is aimed to establish the baseline data of naturally occurring radionuclides within the site. The average activity concentrations were found to be 416.5, 61.7 and 622.3 Bq kg−1 for 40K, 238U and 232Th, respectively. The activity concentrations and its radiological indices were evaluated and were compared with the international values reported by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). The ratio of 40K/232Th and 40K /238U were calculated, which indicates the presence of 5.79 and 2.69 times more K-bearing minerals as compared with Th and U-bearing minerals in the soil samples, respectively. The study provides baseline information on concentration of radionuclides and background radiological assessment of the FRFCF site.

Optimization of the selection of analysis methods for the determination of naturally occurring radionuclides

Kerntechnik ◽  
2008 ◽  
Vol 73 (3) ◽  
pp. 118-121
Author(s):  
T. Heinrich ◽  
L. Funke ◽  
M. Köhler ◽  
U.-K. Schkade ◽  
F. Ullrich ◽  
...  
Keyword(s):  
Naturally Occurring ◽  
Analysis Methods ◽  
Naturally Occurring Radionuclides ◽  
Selection Of
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