2011 Particle Accelerator Conference - Classification: Applications of Accelerators, Tech Transfer, Industry / Applications 02: Materials Analysis and Modification

Paper	Title	Page
THP020	Effects of 6 MeV Electron Irradiation on ZnO Nanoparticles Synthesized by Microwave Method	2166
	K.B. Sapnar, V.N. Bhoraskar, S.D. Dhole University of Pune, Pune, India K.M. Garadkar, L..A. Ghule Shivaji University, Nanomaterials Reasearch Laboratory, Kolhapur, India
	The sizes of zinc-oxide (ZnO) nanoparticles were synthesized by microwave method and were tailored by electron irradiation method. The ZnO nanoparticles having size of ~46 nm synthesised by microwave method were exposed to different fluences of 6 MeV electrons over the range from 1x10¹⁵ to 2.5x10¹⁵ e^- /cm². The electron irradiated ZnO nanoparticles were characterized by XRD, SEM, UV techniques. The XRD results show that the particle size reduced continuously from 46 nm to 15 nm with the increase in electron fluence and SEM images also confirms the formation of nanoparticles of minimum size of around 14 nm. The band gap of the ZnO nanoparticle also increased from 3.29 to 3.42 eV as the size reduced. The result shows the ZnO particles are broken in to smaller size under electron irradiation and increase in the band gap indicates the formation of defects in ZnO. The electron irradiation method is found to be an efficient method in tailoring the size of ZnO nano particles. The nanosized ZnO particles can suit for the applications such as photovoltaics, photocells and antimicrobial activity.

THP025	A Cooled Generalized Multiple Target System to Create Positrons for a Compact Tunable Intense Gamma Ray Source	2169
	C. Y. Yoshikawa, C.M. Ankenbrandt Muons, Inc, Batavia, USA A. Afanasev Hampton University, Hampton, Virginia, USA D.V. Neuffer Fermilab, Batavia, USA
	Funding: This work was funded by Pacific Northwest National Laboratory which is operated for the U.S. Department of Energy by Battelle Memorial Institute under Contract DE-AC06-76RLO 1830. A compact tunable gamma ray source has many potential uses in medical and industrial applications. One novel scheme to produce an intense beam of gammas relies on the ability to create a high flux of positrons, which are produced by an electron beam on a high Z target. We present an innovative system which allows for a nearly arbitrary targeting geometry that supports multiple targets, whose optimal design is allowed to be driven by the physics of the positron production processes, while naturally supporting cooling of the targets.

Paper

Title

Page

Effects of 6 MeV Electron Irradiation on ZnO Nanoparticles Synthesized by Microwave Method

2166

K.B. Sapnar, V.N. Bhoraskar, S.D. Dhole
University of Pune, Pune, India
K.M. Garadkar, L..A. Ghule
Shivaji University, Nanomaterials Reasearch Laboratory, Kolhapur, India

The sizes of zinc-oxide (ZnO) nanoparticles were synthesized by microwave method and were tailored by electron irradiation method. The ZnO nanoparticles having size of ~46 nm synthesised by microwave method were exposed to different fluences of 6 MeV electrons over the range from 1x10¹⁵ to 2.5x10¹⁵ e^- /cm². The electron irradiated ZnO nanoparticles were characterized by XRD, SEM, UV techniques. The XRD results show that the particle size reduced continuously from 46 nm to 15 nm with the increase in electron fluence and SEM images also confirms the formation of nanoparticles of minimum size of around 14 nm. The band gap of the ZnO nanoparticle also increased from 3.29 to 3.42 eV as the size reduced. The result shows the ZnO particles are broken in to smaller size under electron irradiation and increase in the band gap indicates the formation of defects in ZnO. The electron irradiation method is found to be an efficient method in tailoring the size of ZnO nano particles. The nanosized ZnO particles can suit for the applications such as photovoltaics, photocells and antimicrobial activity.

THP025

A Cooled Generalized Multiple Target System to Create Positrons for a Compact Tunable Intense Gamma Ray Source

2169

C. Y. Yoshikawa, C.M. Ankenbrandt
Muons, Inc, Batavia, USA
A. Afanasev
Hampton University, Hampton, Virginia, USA
D.V. Neuffer
Fermilab, Batavia, USA

Funding: This work was funded by Pacific Northwest National Laboratory which is operated for the U.S. Department of Energy by Battelle Memorial Institute under Contract DE-AC06-76RLO 1830.
A compact tunable gamma ray source has many potential uses in medical and industrial applications. One novel scheme to produce an intense beam of gammas relies on the ability to create a high flux of positrons, which are produced by an electron beam on a high Z target. We present an innovative system which allows for a nearly arbitrary targeting geometry that supports multiple targets, whose optimal design is allowed to be driven by the physics of the positron production processes, while naturally supporting cooling of the targets.