Alpha Emitter Intrinsic Concentration in Copper required for Nuclear Spectrometry Application

A CAMACHO1,2, G JAWORSKI1 , G KEPPEL1 AND L SAJOBOHUS2,*

1 Laboratori Nazionali di Legnaro, INFN, Viale Universitá 2, I-35020 Legnaro (Pd), Italy

2 Universidad Simón Bolívar, Laboratorio Física Nuclear, Apartado 8900, 1080 A. Caracas, Venezuela

*Email: sajobohus@gmail.com

Abstract Low-level radioactivity content in copper are employed for bolometric thermal radiation sensors and astro-nuclear spectrometers. The required lowest achievable alpha emitters concentration, for treated and untreated surfaces, are measured by Double Sided Silicon Strip Detectors in a high vacuum chamber and provide information on its intrinsic NORM content. Results shows that copper alpha emitters content can be achieved in the range below 0.01 (counts. keV- ¹·kg- ¹·y- ¹) adequate for specific nuclear spectrometry applications.

  DOI: https://doi.org/10.15415/jnp.2017.51020

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/880/1/51020_JNP_Camacho.pdf

Rubber Additions into Concrete and Gamma Radiation Effects on Mechanical Properties and Microwave Absorption Capacity

J COLÍN1 , F. CASTILLO2 , B. LEAL3 , O FLORES2 , I GAMBOA3 AND H MARTÍNEZ

1 Facultad de Ciencias Químicas e Ingeniería, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Col. Chamilpa. C.P. 62209, Cuernavaca, Morelos, México

2 Laboratorio de Espectroscopia, Instituto de Ciencias Físicas, Universidad Nacional Autónoma de México, Apartado Postal 48-3, 62251, Cuernavaca, Morelos, México.

3 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, Apartado Postal 70-543, 04510, Ciudad Universitaria México D.F. México

Abstract

Rubber is the indispensable raw material for the manufacture of tires; it is obtained from plants, trees and currently can be produced synthetically. The tire rubber is mixed with compounds such as carbon black, sulfur, cement, paints, antioxidants, oils and fats, steel wire, almost etc., making impossible to recycle the tires itself. In this work, we investigate, the effects of the incorporation of ground rubber in concrete, mixture designed to establish the possibility of being used in the construction industry. The samples of concrete were addition with, 5 vol. %., 15 vol. % and 25 vol. % of rubber. Samples with different rubber addition were irradiated by a cobalt 60 gamma source to study the effect on their mechanical compression properties and microwave absorption capacity. Likewise, the microwave absorption capacity was studied for both irradiated and the non-irradiated. It was found that between 5 vol. % and 15 vol. % of rubber addition change the mechanical properties approximately 25 %, higher rubber additions result in a decrease in a 75 % of its mechanical properties. The fracture behavior is not the expected one due to as the curves of stress vs. strain show a double slope, which is associated with the concrete porosity and rubber content. The aging with the gamma rays generates loss of mechanical properties, especially at lower rubber addition, since at content greater than 15 Vol % the radiation effect is less. These rubber additions allow moderate deformations in compression, thus contributing to the care and preservation of the environment.

DOI: https://doi.org/10.15415/jnp.2017.51019

LINK:  http://dspace.chitkara.edu.in/jspui/bitstream/1/879/1/51019_JNP_Col%C3%ADn.pdf

Effects of Low-Energy Laser Irradiation on Sperm Cells Dynamics of Rabbit (Oryctolagus Cuniculus)

J.M. DE JESÚS-MIRANDA1 , L. A. MANDUJANO2 , F. MÉNDEZ3 , Y.J. CASTILLO1 , J. MULIA1 , C. GARCÍA4 , Y.E. FELIPE4 AND D. OSORIOGONZÁLEZ1*

1 Laboratorio de Biofísica Molecular de la Facultad de Ciencias. Universidad Autónoma del Estado de México.

2Laboratorio de Diseño y Modelado Biofísico Molecular de la Universidad Mexiquense S. C.

3 Laboratorio de Ecofisiología Animal de la Facultad de Ciencias. Universidad Autónoma del Estado de México.

4 Laboratorio de Biología de la Reproducción de la Facultad de Medicina Veterinaria y Zootecnia. Universidad Autónoma del Estado de México

*Email: dog@uaemex.mx

Abstract:
 Infertility is a world disease in which a couple is unable to achieve pregnancy. There are numerous parameters to determinate fertility; nevertheless, sperm motility is by consensus one of the most important attributes to evaluate male fertility. Contributions to a better understanding of this crucial parameter are imperative; hence, the aim of this investigation was to assess the effect of low-energy laser irradiation on sperm cell dynamics in thawed samples that were cryopreserved. We used a 405 nm blue laser beam to irradiate spermatic cells from rabbit inside a temperature-controlled dispersion chamber at 37 °C; then, we applied an image recognizing system to calculate individual sperm trajectories and velocities. We found that sperms raise its motility after irradiation suggesting that λ=405 nm is an optimal wavelength for spermatic photo-stimulation.

DOI: https://doi.org/10.15415/jnp.2017.51018

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/878/1/51018_JNP_Osorio-Gonz%C3%A1lez.pdf

Study of L-Glutamic Acid in Solid State for its Possible Use as a Gamma Dosimeter at Different Temperatures (77, 195 and 295 K)

A L MELÉNDEZ-LÓPEZ1,2, J CRUZ-CASTAÑEDA1,2, A PAREDESARRIAGA1,3, A NEGRÓN-MENDOZA1*AND S RAMOS-BERNAL1

1Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, UNAM

2 Programa de Maestría y Doctorado en Ciencias Químicas, Universidad Nacional Autónoma de México, UNAM

3 Facultad de Ciencias, Universidad Nacional Autónoma de México, UNAM

 *Email: negrón@nucleares.unam.mx

Abstract The experimental response of the dosimeter as a function of the irradiation temperature plays an important role, and this effect has consequences in the practical applications of dosimetry. In this work, L-glutamic acid (2-aminopentanedioic acid) is proposed to be a good response, easy to handle, and a cheap gamma dosimeter. For this purpose, polycrystalline samples were irradiated with gamma rays at 77, 195, and 295 K and doses in the kiloGray range (43–230 kGy). The potential use of the glutamic acid system as a chemical dosimeter is based on the formation of stable free radicals when the amino acid is exposed to ionizing radiation. The observed species in these experiments were attributed to deamination and decarboxylation reactions that were studied using electron spin resonance (ESR). The results indicate that the analysis generates a linear response as the irradiation dose increases in a reliable range for industrial and research purposes at three different temperatures.

 DOI: https://doi.org/10.15415/jnp.2017.51017

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/877/1/51017_JNP_MELENDEZ%20-%20NEGRON.pdf

Radio-Optically- and Thermally Stimulated Luminescence of Zn(BO2 ) 2 :Tb3+ exposed to Ionizing Radiation

E CRUZ-ZARAGOZA1*, G CEDILLO DEL ROSARIO1,2, M GARCÍA HIPÓLITO2 , J MARCAZZÓ3 , J M HERNÁNDEZ A4 , E CAMARILLO4 AND H MURRIETA S4

1 Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México, A. P. 70-543, 04510 Ciudad de México, México

2 Posgrado en Ciencia e Ingeniería de Materiales, Instituto de Investigaciones en Materiales-UNAM, A. P. 70-360, 04510 Ciudad de México, México

3 Instituto de Física Arroyo Seco-CIFICEN, CONICET-UNCPBA, Pinto 399, 7000 Tandil, Argentina

4 Instituto de Física, Universidad Nacional Autónoma de México, A. P. 20-364, 01000 Ciudad de México, México

*Email: ecruz@nucleares.unam.mx

Abstract The optical absorption of zinc tetraborate at different concentrations of the terbium impurity (0, 0.5, 1, 2, 4, 8 mol%) was analyzed. The radioluminescence (RL) emission spectra was obtained after beta irradiation of a 90Sr/90Y source. The RL spectrum showed the characteristics bands of Tb3+ with two main emissions at 489 nm and 546 nm which corresponding to the5 D4 →7 F6 and 5 D4 →7 F5 transitions respectively in this ion. The OSL and TL characteristics have been analyzed. The stimulation blue light (497 nm) of a diode laser at 500 mA was used to bleach the thermoluminescent (TL) signals obtained with 5Gy of 60Co source. The two main glow peaks (79 and 161 °C) are sensitives under 497 nm stimulation, and they were shifted to higher temperature values and faded their TL intensities. Similar behavior of TL glow curves before and after OSL stimulation with blue light was observed when the samples were exposed to 30 Gy gamma dose of 137Cs irradiator. The OSL signal response was linear with the dose range of 1-10 Gy and increased their response up to 200 Gy gamma dose. The OSL shows a bleaching sensitive shallow traps and diminishing the intensity of the TL glow curves remaining a complex traps distribution. The RL, TL and OSL properties were investigated in Zn(BO2 )2 :Tb3+ phosphor.

 DOI: https://doi.org/10.15415/jnp.2017.51016

LINK: http://dspace.chitkara.edu.in/jspui/bitstream/1/876/1/51016_JNP_%20ECruz-Zaragoza.pdf