Determination of 241 Pu by the method of disturbed radioactive equilibrium using 2πα-counting and precision gamma-spectrometry

Potassium-40 was determined in soil in an area with 40,000 m² situated in the western State of Pernambuco, Brazil. For radiometric measurements, the gamma spectrometry method with a high purity germanium (HPGe) detector was used. Sampling of 78 soil samples has been performed at intervals of 25 m. The specific activities of 40K were calculated based on the photopeak of 1.46 MeV. Values from 541 to 3,572 Bq kg-1 were obtained (mean of 1,827 Bq kg-1). These values allowed the determination of the elemental concentrations as well as the absorbed dose rates in air, 1 m above the ground. The values varied from 1.7 to 11.5% (mean of 6%) and from 23.4 to 154.3 nGy h-1 (mean of 79 nGy h-1), respectively.

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Nondestructive determination of plutonium by gamma spectrometry and neutron well coincidence counting

Journal of Nuclear Materials ◽

10.1016/j.jnucmat.2008.09.038 ◽

2009 ◽

Vol 385 (1) ◽

pp. 131-133 ◽

Cited By ~ 3

Author(s):

Chhavi Agarwal ◽

Sanhita Poi ◽

T.N. Nathaniel ◽

Amol Mhatre ◽

P.C. Kalsi ◽

...

Keyword(s):

Gamma Spectrometry ◽

Coincidence Counting ◽

Nondestructive Determination

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Determination of 137Cs in Sea Water Samples Using Gamma Spectrometry

HNPS Proceedings ◽

10.12681/hnps.2975 ◽

2020 ◽

Vol 13 ◽

pp. 247

Author(s):

N. Evaggeliou ◽

Ch. Lykomitrou ◽

A. Zafiropoulou

Keyword(s):

Gamma Spectrometry ◽

Comparative Evaluation ◽

Sea Water ◽

Germanium Detector ◽

Advantages And Disadvantages ◽

High Purity Germanium ◽

Co Precipitation ◽

Radioanalytical Procedures

In the present study a comparative evaluation of two methods for 137Cs determination (pretreatment for gamma spectrometry) is attempted. One of them is the conventional AMP (ammonium molybdophosphate, (ΝΗ4)3Ρ(Μo3O10)4) method (radiochemical treatment based on coprecipitation) and the other one is a method based on pre-concentration of cesium in situ by using the Mark III Centrifugal Pump. The pump, which is described analytically in the study, is composed of a motor (pump), four cartridge housings (containing the scavengers), a flow meter and a pressure tube (containing the battery pack and the timer board). For justification, this method is compared with the AMP co-precipitation one. Following up the radioanalytical procedures, the gamma spectrometry system (relative efficiency of high purity germanium detector 90%) is also demonstrated, as conformed to mea suring obtained parameters. Finally, the advantages and disadvantages of these two methods are recorded and the application of each one is suggested.

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Radon leakage as a source of additional uncertainty in simultaneous determination of 226Ra and 228Ra by gamma spectrometry—Validation of analysis procedure

Applied Radiation and Isotopes ◽

10.1016/j.apradiso.2013.11.031 ◽

2014 ◽

Vol 87 ◽

pp. 447-451 ◽

Cited By ~ 6

Author(s):

Siiri Suursoo ◽

Madis Kiisk ◽

Antonio Semakalu ◽

Kadri Isakar

Keyword(s):

Simultaneous Determination ◽

Gamma Spectrometry ◽

Analysis Procedure

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Dating mortar by optically stimulated luminescence: A feasibility study

Geochronometria ◽

10.2478/s13386-011-0002-0 ◽

2011 ◽

Vol 38 (1) ◽

pp. 42-49 ◽

Cited By ~ 28

Author(s):

Christian Goedicke

Keyword(s):

Dose Rate ◽

Short Range ◽

Optically Stimulated Luminescence ◽

Radioactive Equilibrium ◽

Lime Mortar ◽

Modulation Techniques ◽

Single Grain ◽

Optical Bleaching ◽

Number Of Publications

AbstractQuartz is the datable component in mortar. Although its luminescence properties are very well studied, the problem of mortar dating arises from a low level of optical bleaching. In order to reduce the time consuming efforts for dating lime mortar in monuments by optically stimulated luminescence, we investigated the most suitable methods of dose and dose rate determination, and we explored tests which are suitable to predict the datability of a given material. Reverting to the large number of publications on sedimentary partially bleached quartz we found linear modulation techniques especially useful, equally we also recommend the determination of the level of optical depletion before starting analyses. Single grain analysis is regarded as an ultimate but infallible tool to date very poorly bleached quartz from mortar. Dose rate measurements need to take into account the radioactive equilibrium of the uranium decay and the short range inhomogeneity of the environmental gamma radiation field: gamma spectrometry and on-site TLD measurements are best suited.

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Determination of anthropogenic contamination by 137Cs, 240Pu/239Pu and 235U/238U in lichens and mosses from Russian Arctic areas

10.5194/egusphere-egu21-12997 ◽

2021 ◽

Author(s):

Susanna Salminen-Paatero ◽

Paul Dutheil ◽

Timo Sundström ◽

Ilia Rodushkin ◽

Jussi Paatero

Keyword(s):

Gamma Spectrometry ◽

Russian Arctic ◽

Anthropogenic Contamination ◽

Terrestrial Environment ◽

Arctic Regions ◽

Franz Josef Land ◽

Icp Ms ◽

Nuclear Events ◽

Hpge Gamma Spectrometry

Lichen and moss samples were collected from Russian Arctic areas (Kola Peninsula, Franz Josef Land and few other locations) in the 1990s. In 2020, 137Cs was determined by HPGe gamma spectrometry from these samples after which isotopes of Pu and U were radiochemically separated from the samples. Mass ratios 240Pu/239Pu and 235U/238U were determined by ICP-MS for utilizing the characteristic isotopic fingerprints of different nuclear events. The aim of the work was to survey radioactive contamination sources in terrestrial environment in Russian Arctic regions, which have not yet been completely explored in respect to anthropogenic isotopes and their origin in the environment.

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