Development of a new nanocrystalline alloy for X-ray shielding

ABSTRACT The purpose of this study was to develop a new nanocrystalline alloy material, which can replace lead for the purposes of radiation shielding as it is not hazardous to the human body and it is light in weight, to use the developed alloy in a fiber, and to evaluate its performance. This study used tungsten carbide and cobalt as the base metals and developed a new nanocrystalline alloy material. Then, radiation-shielding fibers 0.2 and 0.4 mm thick were created from the prepared tungsten carbide and cobalt powder. Equivalent dose was measured and shielding rate was obtained by the lead-equivalent test method for X-ray protection of goods suggested in the Korean Standard. According to our results, the shielding rate of the 0.2-mm-thick WC–Co alloy was 96.52% at a tube voltage of 50 kVp, 94.86% at a tube voltage of 80 kVp, and 94.10% at a tube voltage of 100 kVp. The shielding rate of the 0.4-mm-thick WC–Co alloy was 97.47% at a tube voltage of 50 kVp, 96.57% at a tube voltage of 80 kVp, and 95.63% at a tube voltage of 100 kVp. It is believed that the nanocrystalline WC–Co alloy developed for radiation shielding in this study will contribute to a decrease in primary X-ray exposure as well as exposure to low-dose secondary X-rays, such as scattered rays. Furthermore, the use of a nanocrystalline WC–Co alloy oxide rather than lead will allow for the development of shielding wear that is lighter and contribute to the development of various radiation-shielding products made of environmentally friendly materials.

[1]  Yun-Chuan Xu,et al.  One-dimensional lead borate nanowhiskers for the joint shielding of neutron and gamma radiation: controlled synthesis, microstructure, and performance evaluation , 2017 .

[2]  H. Miri-Hakimabad,et al.  Effects of shielding the radiosensitive superficial organs of ORNL pediatric phantoms on dose reduction in computed tomography , 2014, Journal of medical physics.

[3]  J. Cho,et al.  Analysis of low-dose radiation shield effectiveness of multi-gate polymeric sheets , 2014 .

[4]  Seon-Chil Kim,et al.  Performance evaluation of a medical radiation shielding sheet with barium as an environment-friendly material , 2012 .

[5]  W. Jeong Radiation exposure and its reduction in the fluoroscopic examination and fluoroscopy-guided interventional radiology , 2011 .

[6]  Johannes T Heverhagen,et al.  The presence of iodinated contrast agents amplifies DNA radiation damage in computed tomography. , 2011, Contrast media & molecular imaging.

[7]  G. Ha,et al.  Synthesis of Nano-sized Tungsten Carbide - Cobalt Powder by Liquid Phase Method of Tungstate , 2011 .

[8]  D. Ribeiro,et al.  Biomonitoring of DNA damage and cytotoxicity in individuals exposed to cone beam computed tomography. , 2010, Dento maxillo facial radiology.

[9]  John Damilakis,et al.  Eye-lens bismuth shielding in paediatric head CT: artefact evaluation and reduction , 2010, Pediatric Radiology.

[10]  H. Sohn,et al.  Synthesis, sintering, and mechanical properties of nanocrystalline cemented tungsten carbide - A review , 2009 .

[11]  D. Brenner,et al.  Computed tomography--an increasing source of radiation exposure. , 2007, The New England journal of medicine.

[12]  Ning Pan,et al.  Grab and Strip Tensile Strengths for Woven Fabrics: An Experimental Verification , 2005 .

[13]  G. Shao,et al.  Preparation of WC-Co powder by direct reduction and carbonization , 2005 .

[14]  Donald P Frush,et al.  In-plane bismuth breast shields for pediatric CT: effects on radiation dose and image quality using experimental and clinical data. , 2003, AJR. American journal of roentgenology.

[15]  F. Mettler,et al.  Skin injuries from fluoroscopically guided procedures: part 1, characteristics of radiation injury. , 2001, AJR. American journal of roentgenology.

[16]  S. Berger,et al.  Sintering study of nanocrystalline tungsten carbide powders , 1998 .

[17]  B. Kear,et al.  Processing and properties of nanostructured WC-Co , 1992 .

[18]  David J. Smith,et al.  Observations of nanocrystals in thin TbFeCo films , 1989 .

[19]  P. Mcginley,et al.  Production of photoneutrons in a lead shield by high-energy x-rays. , 1988, Physics in medicine and biology.

[20]  I. Kaffe,et al.  Efficiency of the cervical lead shield during intraoral radiography. , 1986, Oral surgery, oral medicine, and oral pathology.

[21]  R. Birringer,et al.  Nanocrystalline materials an approach to a novel solid structure with gas-like disorder? , 1984 .

[22]  Quan‐Ping Zhang,et al.  Elevated gamma-rays shielding property in lead-free bismuth tungstate by nanofabricating structures , 2018 .

[23]  S. D. Smith,et al.  Hall-petch strengthening for the microhardness of twelve nanometer grain diameter electrodeposited nickel , 1986 .