Radon emanometric technique for 226Ra estimation

Maharana, Mandakini; Eappen, K.P.; Sengupta, Debashish

doi:10.1007/s10967-010-0585-6

Cited by 14 publications

(33 citation statements)

References 9 publications

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“…Therefore, it is natural to explore the symmetry from the perspective of the worldsheet. The T-duality symmetry, associated with closed bosonic string, has been investigated from the worldsheet perspective in a general framework almost two decades ago [22]. The closed bosonic string was considered in the presence of its massless backgrounds when d of its target space coordinates were compactified on a torus.…”

Section: T-duality Compactified String: Massless Sectormentioning

confidence: 99%

“…We introduce dual coordinates corresponding to each compact coordinate and dual backgrounds to derive another set of equations of motion. The two sets of equations of motion are suitably combined to derived O(d, d) covariant equations of motion [22] where d is the number of compact coordinates. On the other hand when T-duality is analyzed in a general setting its salient features and powerful applications are exhibited from the view point of the target space in the effective action approach.…”

Section: T-duality Compactified String: Massless Sectormentioning

confidence: 99%

“…Furthermore, it is demonstrated that perturbative spectrum of the theory remains invariant under the T-duality. Next it is shown, in the Lagrangian formulation, how the string equations of motion can be cast in a duality covariant manner [22]. A brief excursion is made to study T-duality from the effective action point of view for the sake of completeness.…”

Section: Introductionmentioning

confidence: 99%

“…for compact coordinates, can be expressed in T-duality covariant form. However, for closed bosonic string the equations of motion can be expressed in duality covariant form [22] as we shall see later. We achieved this objective by studying the equations of motion in the superfield formalism.…”

Section: Introductionmentioning

confidence: 99%

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The Worldsheet Perspective of T-Duality Symmetry in String Theory

Maharana

2013

Int. J. Mod. Phys. A

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The purpose of this article is to present a pedagogical review of T-duality in string theory. The evolution of the closed string is envisaged on the worldsheet in the presence of its massless excitations. The duality symmetry is studied when some of the spacial coordinates are compactified on d-dimensional torus, T d . The known results are reviewed to elucidate that equations of motion for the compact coordinates are O(d, d) covariant, d being the number of compact directions. Next, the vertex operators of excited massive levels are considered in a simple compactification scheme. It is shown that the vertex operators for each massive level can be cast in a T-duality invariant form in such a case. Subsequently, the duality properties of superstring is investigated in the NSR formulation for the massless backgrounds such as graviton and antisymmetric tensor. The worldsheet superfield formulation is found to be very suitable for our purpose. The Hassan-Sen compactification is adopted and it is shown that the worldsheet equations of motion for compact superfields are O(d, d) covariant when the backgrounds are independent of superfields along compact directions. The vertex operators for excited levels are presented in the NS-NS sector and it is shown that they can be cast in T-duality invariant form for the case of Hassan-Sen compactification scheme. An illustrative example is presented to realize our proposal.

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Section: T-duality Compactified String: Massless Sectormentioning

confidence: 99%

Section: T-duality Compactified String: Massless Sectormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Worldsheet Perspective of T-Duality Symmetry in String Theory

Maharana

2013

Int. J. Mod. Phys. A

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“…Gross alpha, gross beta and 226 Ra activity can be used to establish the TID (Total Indicative Dose). There are various methods of measuring 226 Ra, including g-spectrometry (Kahn et al, 1990;Cazala et al, 2003;Dulaiova and Burnett, 2004), a-spectrometry (Purkl and Eisenhauer 2003;Bojanowski et al, 2005), radon emanometric methods (Lucas et al, 1990;Maharana et al, 2010) and liquid scintillation techniques with radiochemical separation (Salonen, 1993;Repine and Benedik, 2002) or without separation (Salonen, 2006).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous determination of gross alpha, gross beta and 226Ra in natural water by liquid scintillation counting

Fons¹,

Zapata-García²,

Tent³

et al. 2013

Journal of Environmental Radioactivity

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a b s t r a c tRn and its short-lived decay daughters. The evaporation process concentrated the sample ten-fold. Afterwards, a sample aliquot of 8 mL was mixed with 12 mL of Ultima Gold AB scintillation cocktail in low-diffusion vials.In this study, a theoretical mathematical model based on secular equilibrium conditions between 226 Ra and its short-lived decay daughters is presented. The proposed model makes it possible to determine 226 Ra activity from two measurements. These measurements also allow determining gross alpha and gross beta simultaneously. To validate the proposed model, spiked samples with different activity levels for each parameter were analysed. Additionally, to evaluate the model's applicability in natural water, eight natural water samples from different parts of Spain were analysed. The eight natural water samples were also characterised by alpha spectrometry for the naturally occurring isotopes of uranium ( Ra activity were compared with alpha spectrometry characterization, and an acceptable concordance was obtained.

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Heavy Metal and Radionuclide Contaminant Migration in the Vicinity of Thermal Power Plants: Monitoring, Remediation, and Utilization

Sengupta

Agrahari

2017

Modelling Trends in Solid and Hazardous Waste Management

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Radon emanometric technique for 226Ra estimation

Cited by 14 publications

References 9 publications

The Worldsheet Perspective of T-Duality Symmetry in String Theory

The Worldsheet Perspective of T-Duality Symmetry in String Theory

Simultaneous determination of gross alpha, gross beta and 226Ra in natural water by liquid scintillation counting

Heavy Metal and Radionuclide Contaminant Migration in the Vicinity of Thermal Power Plants: Monitoring, Remediation, and Utilization

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