Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Growth of Li2B4O7 Single Crystal and Its Thermoluminescent Properties

Li2B4O7 단결정 성장과 열형광 특성

  • Park, Kang-Soo (Department of Physics & RCDAMP, Pusan National University) ;
  • Ahn, Jung-Keun (Department of Physics & RCDAMP, Pusan National University) ;
  • Kim, Dong-Jin (Department of Physics & RCDAMP, Pusan National University) ;
  • Hwang, Yoon-Hwae (Department of Physics & RCDAMP, Pusan National University) ;
  • Kim, Hyung-Kook (Department of Physics & RCDAMP, Pusan National University) ;
  • Park, Myeong-Hwan (Department of Radiologic Technology, Daegu Health College) ;
  • Kang, Hee-Dong (Department of Physics, Kyungpook National University) ;
  • Kim, Do-Sung (Devision of Science Education, Daegu University)
  • Published : 2003.01.30
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Abstract

Thermoluminescent properties of $Li_2B_4O_7$ single crystal grown by Czochralski method have been investigated. The high quality $Li_2B_4O_7$ single crystal without core was obtained at rotation speed of 10 rpm for seed crystal and pulling speed below $0.18\;mm{\cdot}h^{-1}$. The structure of $Li_2B_4O_7$ single crystal was classified as tetragonal by XRD analysis. The TL glow curve was composed with three overlapped peaks which can be easily deconvoluted and the TL response of $Li_2B_4O_7$ single crystal TLD to X-ray radiation is linear within the range of $50\;mGy{\sim}1.5\;Gy$. Activation energies of three TL glow peaks analyzed by the various heating rates method and PL spectrum were 0.93, 1.78 and 2.25 eV, respectively.

Czochralski 법으로 조직등가 물질인 $Li_2B_4O_7$ 단결정을 성장하고 열형광 특성을 조사하였다. 단결정 성장시 증자결정의 회전속도는 10 rpm, 인상속도는 $0.18\;mm{\codt}h^{-1}$ 이하에서 core가 없는 양질의 단결정을 얻을 수 있었으며, X-선 회절분석을 통해 성장한 $Li_2B_4O_7$ 단결정의 구조는 정방정계임을 확인하였다. 열형광 glow 곡선은 쉽게 분해할 수 있는 세 개의 peak들이 중첩되어 나타났으며, X-선에 대한 $Li_2B_4O_7$ 단결정 TLD의 열형광감도는 50 mGy에서 1.5 Gy까지의 선량범위에서 선형적으로 나타났다. 가온율법에 의한 열형광 glow 곡선 분석과 PL 스펙트럼 분석 결과에 의한 glow peak의 활성화에너지는 각각 0.93, 1.78, 2.25 eV으로 평가되었다.

Keywords

References

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