An Experiment Study on The Characteristics of X-Ray Shielding In Carbon Nano Tube Mixed Concrete

Abstract

Radiation itself possess various characteristics and is thus used in research in various ways. Observations using radiation is very commonly used in fields such as biology, medicine and etc. However, because energy and quantity of electric charge of radiation is large and thus applies directly to atom or molecule, breaking down the primary structure of DNA, it exerts extremely negative effect on living organism. If a living organism is infected by radiation, mutation occurs and thus possibility of deformation or changes in living organism becomes high. In addition, if it applies on a living organism, its cells may die or cause cancer. There are examples such as the aftermath of atomic bomb used in World War II and accidents that occurred in Chernobyl nuclear facility and in Japan Fukushima. After the Fukushima nuclear accident on March 2011 until December, it has been verified that over half of the employees who were sent to repair the facility were covered with over the standard limit and furthermore, the radiation level in Fukushima area on August 2013 was 4 times above the average rate. Strange plants have emerged in surrounding neighborhoods. Facilities that use radiation shielding can be divided into research institutions, hospitals, nuclear plants and etc and carriers are known to operate by using nuclear energy. In case hospitals, it can be categorized into therapeutic radioactive room, x-ray room and etc while RI usage facilities are used in research facilities. This research was conducted to come up with approaches to protect humans, plants and animals who are exposed to radiation and also to make available radiation shielding methods by using paste where CNT and burst furnace slag are mixed to apply on interior walls of facilities that use nuclear energy or radiation. Thus this research makes the following conclusion. First, prior to undertaking the actual test, preliminary test on electricity conductivity was unertaken with wrap type CNT, powder type CNT and powder type MWCNT. Result showed that Wrap type CNT had dispersion problem thus showed very low workability and powder type SWCNT showed economical problem. It was workable with powerder type MWCNT below 2.5%wt, but with over 2.5% wt, workability and stiffness fell significantly. We suppose that this is because of MWCNT's trait of condensing with each other. This research used many variables to test x-ray shielding. Specimen used in the experiment considered the x-ray shielding rate, thus we used specimen made 28 days ago with W/C 20%. Test result showed that specimen with highest level of MWCNT mixed showed the highest shielding rate and low MWCNT mix showed low shielding rate. This shows the shielding effect of MWCNT. We believe this took place as X-ray has similar traits with electromagnetic wave.