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Abstract
In 2011, Fukushima nuclear power plant accident inJapan caused contamination of lakes and rivers due toradioactive materials released. As time passes, theradioactivity of contaminated water has been lowered,
but there is still some level of radioactive Abstractcontamination. And, concerns about nuclear safety In 2011, Fukushima nuclear power plant
havebeenraised
globally.
At
present, accident in Japan caused contamination of lakes
decontamination of radioactive contaminated water and rivers due to radioactive materials released..
uses methods of removing radioactive materials in The conventional decontamination methods
polluted water by using resin or filter. These using chemical precipitation and ion exchange
conventional decontamination methods can lower the can lower the radioactive concentration ofradioactive concentration of contaminated water to a contaminated water to a certain level. However,certain level. However, it is difficult to reduce the it is difficult to purify the large amount ofamount of contaminated water to a level lower than contaminated water to a level lower than thethe very low level due to technical and economic very low level due to technical and economic
page 1 reasons. Also, it is a time-consuming and costly reasons. Microalgae have recently been applied
process to dispose of a large amount of radioactive for the removal of the water-soluble radioactive
waste generated in the dismantling of a nuclear power materials as well as bio-energy and high-value
plant, and many researches are needed to minimize material resource. In this study, we develop aand recycle radioactive waste in nuclear power plants small prototype of radioactivity measuring
around the world.
device using NaI(Tl) scintillator withMicro-algae are a phytoplankton that has recently photomultiplier tube in order to measure
been re-examined as a future clean energy and radioactivity in the decontamination system,
material resource. The micro-algae are already a which is based on semi-permeable membranepotential resource for producing the energy industry containing radionuclide-removing microalgaematerials and reducing the greenhouse gas.
into radioactive contaminated water.
In this study, to measure the radioactivity in thedecontamination system using micro-algae, wedeveloped a small prototype of radioactivity
measuring device using NaI(Tl) scintillator with
Photomultiplier tube.

page 1 Jongman Lee2

Seungyop Lee2

Sogang University2
Korea Research Institute of Standards and Science
page 1 267, Gajeong-ro, Yuseong-gu, Daejeon, Republic of 35, Baekbeom-ro, Mapo-gu, Seoul, Republic ofKorea2
Korea2
Fig.1. Principle of removal of radionuclides
Fig.1. Principle of removal of radionuclides using thepage 2
using the microalgae and semi-permeable
micro-algae
membraneFig.2. A cross-sectioned HRTEM image of C.
Fig.2. A cross-sectioned HRTEM image of C. vulgaris
vulgaris cells and Conceptual model for apage 2 cells and Conceptual model for a microalgal
microalgal absorption and surface-carbonating
absorption and surface- carbonating process.
process.[4]Fig.3. Removal efficiency of C. vulgaris in thepage 2
Deleteenvironment of each radioactive 137Cs contamination

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Fig 4. A simple diagram of the post-treatment Fig 3. A simple diagram of the post-treatment
systemsystemReference–[2] Brumfiel G(2011) Fukushima reaches cold
shutdown. Nature 474: 135-136.
[4] Lee SY(2014) Photosynthetic biomineralization ofradioactive Sr via microalgal CO2absorption.
[11] Bystrzejewska - Piotrowska G, Urban PL“Accumulation of cesium in leaves of Lepidium
page 5 sativum and its influence on photosynthesis andtranspiration”, Acta Biol Cracov Bot 456:131137(2003)[12] Shin-ya Fukuda, et al., “Global searches formicro-algae and aquatic plants that can eliminate
radioactive cesium, iodine and strontium from theradio-polluted aquatic environment : a bioremediation
strategy”, JPR symposium

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