Dose Calibration and Track Diameter Distribution for 241Am-Be Neutron Source, Using CR-39 Nuclear Track Methodology

 

• J. S. BogardOak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831-6480, USA
• J. I. GolzarriInstitute of Physics, National Autonomous University of Mexico (UNAM), 04520 Mexico City, Mexico
• G. EspinosaInstitute of Physics, National Autonomous University of Mexico (UNAM), 04520 Mexico City, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61013

Keywords: Americium beryllium neutron source, track density imaging, CR-39 Nuclear Track, chemical etching process

Abstract

In neutron detection, the more common method is using electronic instrumentation associate with Bonner spheres, however, currently the Nuclear Tracks Methodology (NTM) is coming popular because of the simplicity, flexibility in size of the detector, no requirement for sophisticated instrumentation and installation, and low cost. In this work, a preliminary result of the dose calibration and track diameter distribution of Americium-Beryllium (241Am-Be) source using Nuclear Track Methodology is presented. As material detector, CR-39 polycarbonate, cut in 1.8 × 0.9 cm2 chips was chosen, and two step chemical etchings after neutron exposure was used to develop the tracks. The irradiations were made in environmental normal conditions, in the ORNL neutron calibration facilities. The CR-39 chips were placed in a phantom, with 3mm plastic (Lexan) sheet in between the source and detectorsto increase the proton generation. The total track density and track diameter distribution was performing in a Counting and Analysis Digital Image System (CADIS), developed at the Institute of Physics of the University of Mexico UNAM. The results are compared with a standard survey instrument and energy reference spectra of the International Atomic Energy Agency (IAEA).

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Issue

Vol 6 No 1 (2018)

How to Cite

J. S. Bogard; J. I. Golzarri; G. Espinosa. Dose Calibration and Track Diameter Distribution for 241Am-Be Neutron Source, Using CR-39 Nuclear Track Methodology. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 77-80.

Evolution of Shapes and Search for Shape Coexistence in Sd-Shell Nuclei by M.Kumawat, G. Saxena, M. Kaushik, S. K. Jain and M. Aggarwal

Evolution of Shapes and Search for Shape Coexistence in Sd-Shell Nuclei

M.Kumawat, G. Saxena, M. Kaushik, S. K. Jain and M. Aggarwal

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  https://doi.org/10.15415/jnp.2018.52025

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VOLUME 5, NUMBER 2 (FEB-2018)

KEYWORDS	Relativistic mean-field theory; Macroscopic-microscopic approach (Mac-Mic); Shape-coexistence; Shape transition; sd-shell nuclei.
PUBLISHED DATE	February 2018
PUBLISHER	The Author(s) 2018. This article is published with open access at www.chitkara.edu.in/publications
ABSTRACT	A detailed and systematic study has been performed using state dependent Relativistic Mean-Field plus BCS (RMF+BCS) approach to investigate shape evolution for even-even isotopes of Ne, Mg, Si and S. We perform quadrupole constraint calculation using NL3* parameter and look into the variation of binding energy with respect to deformation and find the shape and deformation corresponding to energy minima. We find various isotopes showing shape coexistence and shape transition while moving from proton drip-line to neutron drip-line. These results are compared with Macroscopic-microscopic approach (Mac-Mic) with Nilson Strutinsky (NS) prescription and some other works and are found consistent for these sd-shell nuclei.
Page(s)	283–290
URL	http://dspace.chitkara.edu.in/jspui/bitstream/123456789/708/1/003JNP_Kumwat.pdf
ISSN	Print : 2321-8649, Online : 2321-9289
DOI	https://doi.org/10.15415/jnp.2018.52025
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The Three-Body Structure of 2n and 2p Halo Nuclei I. Sreeja and M. Balasubramaniam

A three-cluster model developed for ternary fission studies has been applied for the first time to study the three-body structure of 2n and 2p halo nuclei. For the experimentally known 2n, 2p halo nuclei, all possible ternary fragmentation potential energy surface (PES) is calculated. The two-body breakup reported earlier, clearly indicated a strong minimum in the PES corresponding to 1n/1p and/or 2n/2p cluster plus core configuration. However, the present calculations of PES reveal that, the three- body breakup does not result always with 2n and/or 2p as a cluster. A 1n and/or 1p cluster along with the core is initially formed, and then the core loses one nucleon to make either a 2n plus core or 2p plus core structure. The results are substantiated with the calculations of preformation probability calculated within quantum mechanical fragmentation theory.

URL	http://dspace.chitkara.edu.in/jspui/bitstream/123456789/707/1/002JNP_Sreeja.pdf
ISSN	Print : 2321-8649, Online : 2321-9289
DOI	https://doi.org/10.15415/jnp.2018.52024
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Distinguishing Features of Radioactive Compound Nucleus Decays within the Dynamical Cluster decay Model

Hemdeep, Sahila Chopra, Pooja Kaushal and Raj K. Gupta

Dynamical cluster-decay model; deformed non-coplanar fragments; non-compound nucleus effects; radioactive nuclei. In this paper, we are interested to study the distinguishing features of the decaying radioactive compound nuclei 246Bk* and 220Th*, using the Dynamical Cluster-decay Model (DCM) with deformation β and non-coplanar degree-of-freedom Φ. 246Bk* and 220Th* have so-far been studied within the DCM, using quadrupole deformations (β2i), “optimum” orientations (θopt) of the two nuclei lying in the same plane (Φ=0o), which shows that there is a non-compound nucleus (nCN) content in the observed data. The first turning point Ra (equivalently, the neck-length ∆R in Ra=R1+R2+∆R), which fixes both the preformation and penetration paths, is used to best fit the measured evaporation residue (ER) and fusion-fission (ff) cross sections, σER, σff, respectively, in 220Th* and 246Bk*, formed via different entrance channels. In this work, we subsequently add higher multipole deformations, the octupole and hexadecupole (β3i, β4i), `compact’ orientations θci and Φ≠00, and look for their effects on the nCN contribution predicted by the DCM calculations referenced above. URL http://dspace.chitkara.edu.in/jspui/bitstream/123456789/706/1/001JNP_Hampdeep.pdf ISSN Print : 2321-8649, Online : 2321-9289 DOI https://doi.org/10.15415/jnp.2018.52023 B. B. Singh, M. K. Sharma, and R. K. Gupta, Phys. Rev. C 77, 054613 (2008). https://doi.org/10.1103/PhysRevC.77.054613 R. K. Gupta and M. Bansal, Int. Rev. of Phys. (I.RE.PHY) 5, 74 (2011). M. Bansal, Ph.D. Thesis, Panjab University, Chandigarh, (2012). Hemdeep, S. Chopra, A. Kaur, and R. K. Gupta, Phys. Rev. C 95, 014609 (2017). https://doi.org/10.1103/PhysRevC.95.014609 R. K. Gupta, M. Manhas and W. Greiner, Phys. Rev. C 73, 054307 (2006). https://doi.org/10.1103/PhysRevC.73.054307 C. C. Sahm, et al., Nucl. Phys. A 441, 316 (1985). https://doi.org/10.1016/0375-9474(85)90036-3 D. Vermeulen, et al., Z. Phys. A 318, 157 (1984). https://doi.org/10.1007/BF01413464 G. N. Knyazheva, et al., Phys. Rev. C 75, 064602 (2007). https://doi.org/10.1103/PhysRevC.75.064602 D. A. Mayorov, et al., Phys. Rev. C 90, 024602 (2014). https://doi.org/10.1103/PhysRevC.90.024602 P. Kaushal, S. Chopra, Hemdeep, and R. K. Gupta, Proceedings DAE-BRNS Symposium on Nucl. Phys. 62, 480 (2017). R. K. Gupta, in Clusters in Nuclei, Lecture Notes in Physics 818, edited by C. Beck, Vol. I, (Springer Verlag, Berlin, 2010), pp. 223–265. R. K. Gupta, R. Kumar, N. K. Dhiman, M. Balasubramaniam, W. Scheid, and C. Beck, Phys. Rev. C 68, 014610 (2003). https://doi.org/10.1103/PhysRevC.68.014610 R. K. Gupta, M. Balasubramaniam, R. Kumar, N. Singh, M. Manhas, and W. Greiner, J. Phys. G: Nucl. Part. Phys. 31, 631 (2005). https://doi.org/10.1088/0954-3899/31/7/009 H. Kroeger and W. Scheid, J. Phys. G 6, L85 (1980). https://doi.org/10.1088/0305-4616/6/4/006 S. S. Malik and R. K. Gupta, Phys. Rev. C 39, 1992 (1989). https://doi.org/10.1103/PhysRevC.39.1992 N. J. Davidson, S. S. Hsiao, J. Markram, H. G. Miller, and Y. Tzeng, Nucl. Phys. A 570, 61c (1994). https://doi.org/10.1016/0375-9474(94)90269-0 M. Balasubramaniam, R. Kumar, R. K. Gupta, C. Beck, and W. Scheid, J. Phys. G: Nucl. Part. Phys. 29, 2703 (2003). https://doi.org/10.1088/0954-3899/29/12/003 G. Audi, A. H. Wapstra, and C. Thiboult, Nucl. Phys. A 729, 337 (2003). https://doi.org/10.1016/j.nuclphysa.2003.11.003 P. Möller, J. R. Nix, W. D. Myers, and W. J. Swiatecki, At. Data Nucl. Data Tables 59, 185 (1995) W. Myers and W. J. Swiatecki, Nucl. Phys. 81, 1 (1966). https://doi.org/10.1016/0029-5582(66)90639-0 S. Jensen and J. Damgaard, Nucl. Phys. A, 203, 578 (1973). https://doi.org/10.1016/0375-9474(73)90365-5 R. K. Gupta, N. Singh, and M. Manhas, Phys. Rev. C 70, 034608 (2004). https://doi.org/10.1103/PhysRevC.70.034608 S. Chopra, M. Bansal, M. K. Sharma, and R. K. Gupta, Phys. Rev. C 88, 014615 (2013). https://doi.org/10.1103/PhysRevC.88.014615 M. Manhas and R. K. Gupta, Phys. Rev. C 72, 024606 (2005). https://doi.org/10.1103/PhysRevC.72.024606

Study of Solid-State Radiolysis of Behenic, Fumaric, and Sebacic Acids for their Possible Use as Gamma Dosimeters Measured Via ATR-FT-IR Spectroscopy

 

• J. Cruz-CastañedaInstitute of Nuclear Sciences, National Autonomous University of Mexico (UNAM), PO Box 70-543, 04510 Mexico City, Mexico; Master’s and PhD Program in Chemical Sciences, National Autonomous University of Mexico (UNAM). PO Box 70-543, 04510 Mexico City, Mexico
• A. L. Meléndez-LópezInstitute of Nuclear Sciences, National Autonomous University of Mexico (UNAM), PO Box 70-543, 04510 Mexico City, Mexico; Master’s and PhD Program in Chemical Sciences, National Autonomous University of Mexico (UNAM). PO Box 70-543, 04510 Mexico City, Mexico
• A. HerediaInstitute of Nuclear Sciences, National Autonomous University of Mexico (UNAM), PO Box 70-543, 04510 Mexico City, Mexico
• S. RamosbernalInstitute of Nuclear Sciences, National Autonomous University of Mexico (UNAM), PO Box 70-543, 04510 Mexico City, Mexico
• A. Negrón-MendozaInstitute of Nuclear Sciences, National Autonomous University of Mexico (UNAM), PO Box 70-543, 04510 Mexico City, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61014

Keywords: dosimeter, carboxylic acid, gamma radiation, ATR-FT-IR spectroscopy

Abstract

The intensive use of ionizing radiation has promoted the constant investigation of adequate dosimetric systems in the measurement of doses applied in irradiated products. The objective of this work is to propose gamma dosimetric systems, using carboxylic acids in a solid state and measuring the change via infrared spectroscopy (carboxylic acid/ ATR-FT-IR1). We worked with three systems: (1) behenic acid/ATR-FT-IR, (2) sebacic acid/ATR-FT-IR, and (3) fumaric acid/ATR-FT-IR. The change in absorbance corresponding to the stretching vibration frequency of the carbonyl group to the absorbed dose (in the range of kGy) was measured. The results showed that the acid/ATR-FT-IR systems have a linear response with respect to the absorbed dose, for behenic acid/ATR-FT-IR from 0 to 122 kGy, for ATR-FT-IR sebacic acid from 0 to 61 kGy, and for fumaric acid/ATR-FT-IR from 0 to 34 kGy. The results indicated that the linear response of the absorbance dose in the three systems allows us to continue studying other variables to be able to propose them as chemical dosimeters.

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Issue

Vol 6 No 1 (2018)

How to Cite

J. Cruz-Castañeda; A. L. Meléndez-López; A. Heredia; S. Ramosbernal; A. Negrón-Mendoza. Study of Solid-State Radiolysis of Behenic, Fumaric, and Sebacic Acids for Their Possible Use As Gamma Dosimeters Measured Via ATR-FT-IR Spectroscopy. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 81-85.