방사선조사식품의 객관적 지식수준에 따른 식품 선택 행위차이

Jaerok Kim,Yoonseok Choi,Seungkoo Lee,Pilhan Park,Wook Kim,Jieun Lee,Imsoon Jeong,Youngkyw Harm,Eunok Han 대한방사선방어학회 2014 대한방사선방어학회 학술발표회 논문요약집 Vol.2014 No.04

A Simple Preparation of Monoiodobromosulfophthalein-$^{131}$ I by Isotope Exchange for Medical Use

Kim, Jaerok,Kim, Tae-Ho Korean Nuclear Society 1977 Nuclear Engineering and Technology Vol.9 No.1

Monoiodobromosulfophthalein-$^{131}$ I (MIBSP-$^{131}$ I), one of the useful radiopharmaceuticals for liver function studies, has been prepared by a simple isotope exchange between the MIBSP and the molecular iodine-$^{131}$ I in phosphate buffer, pH 5.3. The pooled cold MIBSP was prepared by a normal iodination of BSP using iodine monochloride, and separated from the iodination mixture by applying a Sephadex LH-20 chromatography. At 10$0^{\circ}C$, the exchange rate was so fast that the reaction could be terminated in 5 min to show upto 95% yield. The final product could be obtained simply by further heating for about 5 min in a boiling water bath in the presence of a small amount of hydrogen peroxide, and subsequent pH adjustment and membrane filtration.

Study on iodine Labelling (II) Efficient of Labelling Rose Bengal, Hippuran, and Human Serum Albumin in Small Scale

Kim, Jaerok Korean Nuclear Society 1972 Nuclear Engineering and Technology Vol.4 No.3

For efficient micro scale syntheses of Rose $Bengal-^{131}I$, $Hippuran-^{131}I$, and $H.S.A.-^{131}I$, the dependence of labelling yields on pH, on salt contents, and on the volume of buffer solution in the reaction mixtures as well as the reaction apparatus were studied. pH of 5.6 was optimum for preparation of both Rose $Bengal-_{131}I$ and Hippuran $-^{13}I$ but pH of 8.5 was optimum for preparation of $H.S.A.-^{131}I$. Salt in the reaction mixtures hindered drastically the formation of $Hippuran-^{131}I$ but it slightly increased the labelling yield of H.S.A.. The compactly closed reaction vessels were effective for preparations of both Rose $Bengal-^{131}I$and $Hippuran-^{131}I$ in small volume. Thereupon, the labelling procedures were modified to bring about higher labelling yields and better reproducibilities. By these newly established procedures, the labelling yields of Rose $Bengal-^{131}I$ and $Hippuran-^{131}I$ could be increased even with the home-produced sodium $iodide-^{131}I$ solution containing reducing agent.

A Study on the Preparation of Wood-Plastic Combinations(III) Preparation of Wood-Plastic Combinations by Thermal Curing Method

Kim, Jaerok,Lee, Kyung-Hee,Pyun, Hyung-Chick Korean Nuclear Society 1972 Nuclear Engineering and Technology Vol.4 No.4

The polymerization rates of monomer or monomer mixture impregnated with catalyst into domestic soft woods such as pinus densiflora, pinus rigida and poplus deltoides e. t. c. were measured. The results were compared with those obtained by radiation curing method and the following conclusions were derived ; (1) Pinus densiflora and pinus rigida are superior to the poplus deltoides, and methyl methacrylate(M. M. A. ) is more effective than other monomers as far as the polymerization rates are only taken into account. (2) The polymerization rate of vinyl acetate is generally slow. And the polymerization rate of the monomer is the slowest in case of being impregnated into poplus deltoides. However, the polymerization rate of the comonomer composed of vinylacetate and M. M. A. is the fastest among the other monomers or monomer mixtures in woods regardless of the curing method. (3) The general trend of polymerization of monomer in wood is similar to that of monomers themselves in both curing methods if the woods contain not much resin.

A Study on the Preparation of Tritium Luminous Compound

Kim, Jaerok Korean Nuclear Society 1972 Nuclear Engineering and Technology Vol.4 No.4

For the syntheses of tritium labelled polystyrene, the basic material for the preparation of tritium luminous compound, various methods of labelling such as Tesla discharge, Wilzbach exposure, gamma irradiation, and U V. irradiation were compared in view of getting high specific activity-product. The obtained polystyrene-T(G) by the method of Tesla discharge and by the method of U. V. irradiation had specific activity of 1~1.2 mCi/mg, and these two methods were the most encouraging. Mixing of 1 part of polystyrene-T(G) with 4 parts of ZnS:Cu phosphor, in weight, appeared to be the most suitable ratio in tile preparation of luminous compound in luminosity point of view. When 30 mg. of obtained luminescent mixture was applied on steel plate by using 1 ml. of the selected binder (i.e., 1g of commercial varnish in 100m1. of benzene) the luminosity maximum was ca. 20 micro Lambert. The prepared luminous compound was confirmed to be practically applicable for mine marker or dark-room light source.

Radioiodine Labeling of Insulin Using Dimethylsulfoxide as a Labelling-Aid

Kim, Jaerok,Kim, Young-Hee Korean Nuclear Society 1977 Nuclear Engineering and Technology Vol.9 No.4

Using dimethylsulfoxide (DMSO) as a labelling aid, insulin--$^{126}$ I of radioimmunoassay use has been effectively prepared. A small amount of DMSO was added to usual labelling mixture ana the reaction time was controled. The labelled insulin obtained in such a way showed improved bindabilities to the antibody and thus expressed larger dose-gradients in the plots of standard dose-response curves even though the labelling rate was decreased to some extent. However, by extending the reaction time to about 1 min, average labelling yield of 30% could be obtained. The average increase of bindability (B/F) in definite antiserum dilution was 2.5 comparing with 1.5 obtained in the absence of DMSO. Thus, the net bindability increase was 70% of those obtained in tile absence of DMSO. By means of a NMR spectrometry, it has been confirmed that the DMSO in the labelling mixtutre is converted to dimethylsulfone by chloramine-T. The results, generally agreed with the Stags's postulation, were discussed in view of a competitive oxidation of DMSO with disulfide linkages of the insulin molecule by the chloramine-T.

A Study on the Preparation of Wood-Plastic Combinations (IV)

Kim, Jaerok,Lee, Kyung-Hee,Pyun, Hyung-Chick Korean Nuclear Society 1973 Nuclear Engineering and Technology Vol.5 No.1

Some physical and chemical properties of wood-plastic combinations(W.P.C.) made of domestic soft woods such as pinus densiflora, pinus rigida and poplus deltoides were measured. The rates of improvement in properties were roughly proportional to the contents of polymer or polymer mixtures in W.P.C. For the W.P.C. obtained by means radiation curing and containing 80% of polymer or polymer mixture, the hardness and water absorptirity were improved 2.2 times and 4 times those of the original wood, respectively. The improvement of hardness was especially remarkable in the W.P.C. made of pinus densiflora and polystyrene(120%) to show 7 times increased hardness. For the W.P.C. obtained by means of thermal curing and containing 80% of polymer or polymer mixture, the hardness and water absorptivity were improved 2.4 times and 3.4 times those of the non-treated woods, respectively. These data indicate that the properties of W.P.C. prepared by means of radiation curing are not much different from those of W. p. C. prepared by means of thermal curing. Both of acid resistancy and alkali resistancy of the W.P.C. were also improved remarkably in comparison with the non-treated wood.

Study on Iodine Labelling (I) Influence of Reducing Agent and Iodate-$^{131}I$ in Sodium iodide-$^{131}I$ solution on Labelling

Kim, Jaerok Korean Nuclear Society 1971 Nuclear Engineering and Technology Vol.3 No.3

In iodine-131 labelling of iodocompounds such as tetrachloro-P-tetraiodo R-fluorescein, sodium orthoiodohippurate and a non-iodocompound, human serum albumin (HSA), the labelling rates and yields are accurately compared with each other. The reaction systems conducted for each compounds were different conditions: sodium iodide-$^{131}$ I containing reducing agent, sodium iodide-$^{131}$ I free from reducing agent, and sodium iodide-$^{131}$ I free from reducing agent but containing considerable amount of iodide-$^{131}$ I etc. The labelling yields were generally poor; 10% in the case of using sodium iodide-$^{131}$ I containing redoing agent, and 50~60% in the case of using sodium iodide-$^{131}$ I free from reducing agent but containing considerable amount of iodide-$^{131}$ I. However, fair yields were obtained in the case of using sodium iodide-$^{131}$ I free from reducing agent and mostly in the form of iodide-$^{131}$ I. The reaction entities involved in these reactions are also briefly discussed.

Efficient Preparation of Radioiodine Labelled 3,5,3'-Triiodothyronine and Thyroxine for Medical Use

Kim, Jaerok,Kim, Tae-Ho Korean Nuclear Society 1975 Nuclear Engineering and Technology Vol.7 No.2

3,5,3'-Triiodothyronine (T$_3$) 및 Thyroxine(T$_4$)의 요오드 동위원소 교환표지에 어서는 T$_3$:I$_2$ 또는 T$_4$:I$_2$의 몰비, PH, 반응시간 둥이 중요인자 임을 알수 있었다. T$_3$ 및 T$_4$를 평균 45%, 50%로 각각 표지할 수 있는 개량될 표지반응 조건 및 전 반응생성물을 씰리카 젤 박판과 클로로포름, 메탄올, 암모니아 둥을 전개용매로 사용하는 박층크로마토그래피로 신속 간편하게 분리, 정제하는 방법을 제시하였다. For isotopic exchange labelling of 3,5,3'-triiodothyronine (T$_3$) and thyroxine (T$_4$) with radioiodide in the presence of molecular iodine, T$_3$:I$_2$ or T$_4$:I$_2$ molar ratios, pH, and reaction time are. considered to be important factors. A modified labelling and separation method is proposed in present paper, by which T$_3$-$^{125}$ I and T$_4$-$^{125}$ I can be obtained with the mean labelling yields of 45%, and 50%, respectively. The whole reaction products can be separated by adoption of thin-layer chromatography technique using silica gel plate and the solvent system composd of chloroform, methanol and ammonia.

Efficient Preparation of Radioiodine Labelled 3,5,3'-Triiodothyronine and Thyroxine for Medical Use

Kim, Jaerok,Kim, Tae-Ho Korean Nuclear Society 1975 JOURNAL- KOREAN NUCLEAR SOCIETY Vol.7 No.2

3,5,3'-Triiodothyronine (T$_3$) 및 Thyroxine(T$_4$)의 요오드 동위원소 교환표지에 어서는 T$_3$:I$_2$ 또는 T$_4$:I$_2$의 몰비, PH, 반응시간 둥이 중요인자 임을 알수 있었다. T$_3$ 및 T$_4$를 평균 45%, 50%로 각각 표지할 수 있는 개량될 표지반응 조건 및 전 반응생성물을 씰리카 젤 박판과 클로로포름, 메탄올, 암모니아 둥을 전개용매로 사용하는 박층크로마토그래피로 신속 간편하게 분리, 정제하는 방법을 제시하였다. For isotopic exchange labelling of 3,5,3'-triiodothyronine (T$_3$) and thyroxine (T$_4$) with radioiodide in the presence of molecular iodine, T$_3$:I$_2$ or T$_4$:I$_2$ molar ratios, pH, and reaction time are. considered to be important factors. A modified labelling and separation method is proposed in present paper, by which T$_3$-$^{125}$ I and T$_4$-$^{125}$ I can be obtained with the mean labelling yields of 45%, and 50%, respectively. The whole reaction products can be separated by adoption of thin-layer chromatography technique using silica gel plate and the solvent system composd of chloroform, methanol and ammonia.