[en] This paper describes the design of the thermoluminescence analyser using microcomputer. TL analyser is designed to perform the three step heat treatment, such as pre-read heating, readout procedure and post-heating (or pre-irradiation ) anneal. We used a 12-bit A/D converter to get the precise measurement and the phase control method to control the heating temperature. Since the used Apple II microcomputer is cheap and popular, it is possible to design the economical system. Experimental results showed the successful operation with flexibility. The error of temperature control was less than ± 0.2% of the expected value. (Author)

[en] New scintillation crystal of a Ba_0.20Sr_0.80Cl₂ grown by the Czochralski technique is reported. The grown crystal was cut into a size of 10x10x10 mm³. The lattice parameter of the grown crystal is a=b=c=7.041 A and the crystal structure is cubic. The luminescence and scintillation properties of the Ba_0.20Sr_0.80Cl₂ crystal were studied. The luminescent characteristics were measured with ultraviolet (UV) light and X-ray source to study the emission spectra of the crystal. Scintillation properties of the crystal such as pulse height spectra, energy resolution, α/β ratio, light output, proportionality curve, and fluorescence decay time were measured with the various radioactive γ-ray sources and α-source at room temperature. The light output of the crystal was compared with that of the CsI(Tl) crystal and the absolute light output was measured with avalanche photodiode (APD). While the light output of the crystal was less than that of the CsI(Tl), the energy resolution was approximately 6.9% for ¹³⁷Cs 662 keV γ-ray with PMT which is similar to that of the CsI(Tl) crystal for ¹³⁷Cs γ-rays. (author)

[en] In this paper, we studied the deposition property of the atmospheric released tritium and the TFWT, OBT and ¹⁴C concentration in the total diet to estimate the internal exposure dose were analyzed. A computational program that measures spectrums from the Nal detecting system, searches peaks, calibrates the energy, calculates exposure rate and displays color spectrums has been developed

[en] The Organically Bound Tritium (OBT) concentrations of the marine organisms (seaweed and shellfish) around Wolsung nuclear power plants were measured. The OBT concentrations of seaweeds were in the range of 0.372∼2.72Bq/kg-fresh. The OBT concentrations of shellfish were in the range of 0.239∼2.02 Bq/kg-fresh. The internal dose due to the OBT concentration of seaweed was estimated as 3.4x10^-7 mSv/year

[en] The concentrations of naturally occurring radioisotopes (²³²Th, ²²⁸Th, ²³⁰Th, ²²⁸Ra, ²²⁶Ra, and ⁴⁰K) in typical Korean foods were evaluated. The daily intakes of these radioisotopes were calculated by comparing concentrations in typical Korean foods and the daily consumption rates of these foods. Daily intakes were as follows: ²³²Th, 0.00-0.23; ²²⁸Th, 0.00-2.04; ²³⁰Th, 0.00-0.26; ²²⁸Ra, 0.02-2.73; ²²⁶Ra, 0.01-4.37 mBq/day; and ⁴⁰K, 0.01-5.71 Bq/day. The total daily intake of the naturally occurring radioisotopes measured in this study from food was 39.46 Bq/day. The total annual internal dose resulting from ingestion of radioisotopes in food was 109.83 μSv/y, and the radioisotope with the highest daily intake was ⁴⁰K. These values were same level compiled in other countries