Laboratory application of NaI(Tl) γ-ray spectrometry to studies of natural radioactivity in geophysics

Chiozzi, P.; Felice, P. De; Fazio, A.; Pasquale, V.; Verdoya, Massimo

doi:10.1016/s0969-8043(00)00123-8

Cited by 93 publications

(45 citation statements)

References 5 publications

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“…Dose rates were estimated from the natural radioactive elements of U, Th and K in the sediment. U, Th and K from DNS OSL P-1, P-3 and P-4 were estimated using NaI:Tl based gamma spectrometer (Chiozzi et al, 2000) and that from DNS OSL P-N were measured using high pure Ge (HPGe) based gamma spectrometer (Shukla et al, 2002). These measurements were carried out from NGRI and PRL, India respectively and the values are tabulated in Table 1.Water content of the samples were assumed to 52 % for DNS OSL P-1 and P-N and 10 ± 5 % for DNS OSL P-3 and P-4.The internal K in feldspar grains was assumed to be 13.5  0.5 %.…”

Section: Sample Selectionmentioning

confidence: 99%

Thermally re-distributed IRSL (RD-IRSL): A new possibility of dating sediments near B/M boundary

Morthekai¹,

Chauhan

Jain³

et al. 2015

Quaternary Geochronology

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This study attempted to probe a geologically more stable IR stimulated luminescence signal (IRSL) that explored so far. IRSL, probes the proximal pairs and, pIRSL measurements at elevated temperatures consume more distant pairs. We surmised that the residual IRSL after pIR-IRSL should arise from most distant pairs and hence should be more stable. A thermal stimulation after pIR-IRSL leads to redistribution of charges including distant pairs and this can be probed by further IRSL and pIRSL (post IR IRSL) measurements. This post IRSL following a thermal treatment is termed as redistributed IRSLs (RD IRSL and RD pIRSL) and contributes about 10% of total IRSL counts from a pristine sample. As expected, RD IRSL has a poor to be solar bleachability. Burial age of around 800 ka(with 30 -40 %) using RD-IRSL and RD-pIRSL were comparable with the palaeomagnetic dating and were a factor of three higher than conventional pIR-IRSL, TRL, IR-RL and VSL ages.

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Section: Sample Selectionmentioning

confidence: 99%

Thermally re-distributed IRSL (RD-IRSL): A new possibility of dating sediments near B/M boundary

Morthekai¹,

Chauhan

Jain³

et al. 2015

Quaternary Geochronology

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“…16 The detector was buried in the soil during all the in situ measurements. The detector had to be submerged in the calibration material in order to accommodate for geometry and to produce a symmetrical setup with that of the in situ measurements.…”

Section: Methodsmentioning

confidence: 99%

Mapping of Historical Human Activities in the Saldanha Bay Military Area

Bezuidenhout

2012

Sci.Mil.

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Saldanha Bay on the west coast of South Africa is surrounded by various nature reserves, military units and training sites. Over a long period of time, large parts of this semi-arid area were exposed to human activities, including military training and the preparation of forces for war. This article investigates the prospect of identifying areas where human activities took place via mapping of the variation in primordial radioactive isotopes. For this purpose, in situ gamma-ray data were obtained from selected locations around Saldanha Bay. The data were used to extract concentrations of primordial radioactive isotopes in these locations. The radioactive primordial isotope concentrations were then mapped and compared to historical evidence of human activities in these areas. The concentrations of potassium isotope showed a relationship to the height above mean sea level. Historical human activities were mainly confined to flatter regions of the area around Saldanha Bay and therefore also relate to the height above mean sea level. The potassium concentrations and the areas where human activities took place were compared and a significant relationship was found.

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“…The intensities of the gamma lines 1. Th, respectively (Chiozzi et al, 2000;IAEA, 2003b). The minimum detectable activity (MDA) of the measurement system was calculated using the formula given by USDOE (1992) as:…”

Section: Sample Preparation and Measurementmentioning

confidence: 97%

Activity concentrations of primordial radionuclides in sediments of surface – water dams in southwest Nigeria – a baseline survey

Isinkaye

Farai

2008

Radioprotection

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Laboratory application of NaI(Tl) γ-ray spectrometry to studies of natural radioactivity in geophysics

Cited by 93 publications

References 5 publications

Thermally re-distributed IRSL (RD-IRSL): A new possibility of dating sediments near B/M boundary

Thermally re-distributed IRSL (RD-IRSL): A new possibility of dating sediments near B/M boundary

Mapping of Historical Human Activities in the Saldanha Bay Military Area

Activity concentrations of primordial radionuclides in sediments of surface – water dams in southwest Nigeria – a baseline survey

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