Search

Copyright of Issues of Forestry Economics is the property of Issues of Forestry Economics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Issues of Forestry Economics is the property of Issues of Forestry Economics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Silk is the property of Zhejiang Sci-Tech University Magazines and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the development of modern science and technology X-ray has brought great economic and social benefits to human beings. However X-ray is increasingly harmful to human health and the environment. X-ray protective clothing is the last line of defense to ensure the safety and health of X-ray workers and patients. Currently the commonly used X-ray protective clothing is made of lead rubber. This kind of lead protective clothing is heavy in weight poor in flexibility easy to crack and high in biological toxicity. And there is a 'weak absorption zone' in the energy range of 40 to 88 keV which is easy to threaten environmental safety and human health. In addition barium sulfate BaSO4 as one of the ideal alternative for lead-containing compounds has the advantages of environmental friendliness weather resistance acid and alkali resistance and low density. In order to produce flexible and lightweight lead-free protective materials with excellent X-ray protection properties BaSO4 is usually selected to combine with other high order metallic element compounds. However there are few systematic research works on the radiation protection properties of single-component BaSO4 -rubber based flexible protective materials. In order to explore the effect of BaSO4 content on the radiation protection properties of protective materials the traditional mixing and multi-roll calendering process was used to prepare BaSO4 -rubber based flexible protective materials for X-ray protection. Firstly the dispersion uniformity of BaSO4 particles in the rubber matrix and the influence of BaSO4 content on the hardness and volume density of the protective materials were studied and the influence of BaSO4 content on the mechanical properties of the BaSO4 -rubber based flexible protective material was analyzed. Then the effect of BaSO4 content on lead equivalent value and radiation protection ratio of protective materials was studied. The results show that BaSO4 micron particles can be evenly dispersed in the natural rubber matrix. With the increase of BaSO4 content the Shore hardness and volume density of the protective material increase because the volume ratio of BaSO4 to the protective material increases. However the breaking strength decreases with the increase of BaSO4 content. The lead equivalent and radiation protection ratio of the BaSO4 -rubber based flexible protective materials increase gradually when BaSO4 content increases. When the filling content of BaSO4 reaches 300 the lead equivalent and the radiation protection ratio of the protective material are 0. 171 5 mmPb and 34. 9% respectively so BaSO4 particles could be used as the protective material for the rear piece of the front and back protective clothing. In addition BaSO4 particles could effectively make up for the ' weak absorption zone ' of lead. The systematic research on the radiation protection performance of BaSO4 -rubber based flexible lead-free protective materials for single-component X-ray protective clothing is potentially beneficial to the subsequent formulation design preparation and product development of multi-component flexible lead-free protective materials containing BaSO4 . This work provides theoretical guidance for the development of multi-component lightweight non-toxic and efficient lead-free flexible composite protective materials for X-ray protection. [ABSTRACT FROM AUTHOR]

Copyright of Wuhan University Journal (Philosophy & Social Sciences) / Wuhan Daxue Xuebao (Zhexue Shehui Kexue Ban) is the property of Wuhan University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)