• 대한화학회지
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• 제37권10호
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• pp.861-866
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• 1993

X-선 형광분광 분석에서 매트릭스 효과를 줄이거나 보정을 해야만 보다 정확한 분석원소의 함량을 구할 수 있다. 매트릭스 계수를 구하기 위하여 표준물질을 이용해야 하는데, 괴상시편(ingot)을 임의의 성분함량별로 제작하려면 고온의 열처리로 어려움이 많으므로 금속산화물의 미세한 분말을 각 성분 함량비로 혼합해서 일정 압력을 가해서 시편을 만들었다. 이 시편의 X-선 형광세기와 농도로서 매트릭스 계수를 구해서 미지물질의 성분함량을 구하였다. 그 결과 Ni에 대해서 Fe와 Cr은 흡수 효과가 우세하고 Cr에 대해서 Fe와 Ni는 증강 효과가 우세하였으며 Fe에 대해서 Ni는 증강 효과가 강하고, Cr은 흡수 효과가 강했다. 그리고 또 이 금속산화물과 괴상시편에서 얻은 X-선 형광세기를 비교 검토하였다.

• 대한치과보철학회지
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• 제8권1호
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• pp.85-89
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• 1968

The author has carried out the statistical standards on liner and angular measurements of sells turcica in 244 normal Korean of various age group by means of lateral cephalometric radiography. The results were as follows; 1. The linear measurements between Ant-Post distance and distance from the tip of tuberculum of sellae to posterior clinoid process were obtained 14.81mm, 9.85mm in the age of 5 years old male and 14.44mm, 9.52mm in female, respectively. There was no outstanding difference with age, but more predominant in female than male. 2. The linear measurements of inferior depth show somewhat increases but no changes in superior depth. 3. It has been showed that the greatest width revealed significant increment beyond 15 years old of both sexes in Korean. 4. None of the significant difference in angular measurement was found with age, but angulation for dorsum sellae decreased after 15 years of male. 5. Generally speaking, increment rates of female in each items were greater than male.

• Journal of Radiation Protection and Research
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• 제6권1호
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• pp.8-24
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• 1981

This paper presents flux-to-dose-rate conversion factors for neutrons and gamma rays based on the American National Standard Institute(ANSI) N666. These data are used to calculated the dose rate distribution of neutron and gamma ray in radiation fields. Neutron flux-to-dose-rate conversion factors for energies from $2.5{\times}10^{-8}$ to 20 MeV are presented; the corresponding energy range for gamma rays is 0.01 to 15 MeV. Flux-to-dose-rate conversion factors were calculated, under the assumption that radiation energy distribution has nonlinearity in the phantom, have different meaning from those values obtained by monoetiergetic radiation. Especially, these values were determined with the cross section library. The flux-to-dose-rate conversion factors obtained in this work were in a good agreement to the values presented by ANSI. Those data will be a useful for the radiation shielding analysis and the radiation dosimetry in the case of continuous energy distributions.

• 대한방사선기술학회지:방사선기술과학
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• 제2권1호
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• pp.31-35
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• 1979

A thorax is consisted of a heart, great vesseles, lungs, ribs, sternum and thoracic spine etc. The quality of chest radiogram is very important in order to find out abnormality in the lung field. The image has two major characteristics; density and contrast which directly influence the diagnostic quality of the roentgenogram. It is very hard to make excellent film image in the lung field because of overlapping bones and other soft tissues. To take a good radiogram of lung field, we studied the condition of chest P-A projection in adult and obtained results as follows: 1. The average chest radiographic condition is resulted as 62KVP, 16 mAs in hospitals around Kyung Ki-Do, Korea, 2. The density of the chest 20cm in thickness, is equal to the water phantom 8cm in thickness. 3. The best quality of chest radiogram is achieved in the condition of the lung field at 100KVP, 9.6mAs by use of Grid 8:1.

• 대한방사선기술학회지:방사선기술과학
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• 제2권1호
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• pp.95-99
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• 1979

When the ${\gamma}-ray$ of average energy 375KeV emitted by Ir-192 is exposed to each film through lead foil with various thickness, the film sensitivity will be different according to the thickness of lead foil and film type. The results on the study, different density and sensitive ratio appeared depending on exposed time and film type, but was made on the following common points. 1. The effect of film sensitivity by the front lead foil showed rapid increase up to the thickness of more or less 0.03mm, and the thicker lead foil was decreased more in the thickness of about $0.05{\sim}0.09mm$. 2. The effect of film sensitivity by the back lead foil was increased up to around of $0.03{\sim}0.08mm$ thickness, the maximum sensitivity was obtained in the thickness of more than $0.03{\sim}0.08mm$ without any change in the above effect. 3. The sensitivity of front lead foil was higher than that of back lead foil in thin lead foil with about 0.127mm thickness, but the sensitivity of back lead foil was higher than that of front lead foil when thickness became thicker.

• 패션비즈니스
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• 제9권2호
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• pp.28-39
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• 2005

This chapter presents how 'optical illusion' works in applying makeup and how to differentiate the direction, location and shape at eyebrow lines in the aspect at physiognomy. For this study, employed were five types of face shape produced by Photoshop program - round, square, long, inverted triangle. and diamond. The best-matched facial shape was examined through a questionnaire research after applying the optical illusion of eyebrow lines to the five types of face shape. The results were revealed to be identical to ones presented in make-up teaching materials. In conclusion, it was found that well-matched shape and size of eyebrow could make some changes in the facial impression, changing the face shape into oval shape. The facial line can be modified and supplemented by reshaping such facial parts as the eyebrow, producing well-balanced facial shape. Consequently, make-up was proved to be one of the methods which can be used to create social and psychological effect which can make a favorable facial impression and individuality, natural impression and image making depending on different purposes, taking advantage of optical illusion effect.

• 대한방사선기술학회지:방사선기술과학
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• 제13권1호
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• pp.29-35
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• 1990

In a attempt to find out the effects of the irradiation on the lymphatic organs of birds, a total of 40 chickens(4 week old) were selected at random and alloted to control and experimental groups. The experiments were irradiated Co-60 ${\gamma}-ray/400$ rads, and then the enzyme histochemical activity of Bursa Fabricious(BF), thymus and spleen and hematological changes were compared with those of controls for 30 days(24 hrs., 5, 10, 20 and 30 days). The results obtained were summarized as follows: 1. The activity of acid phosphatase(ACP) of the reticuloendothelial cells of BF, thymus and spleen and the epithelia of BF of the experiments were increased significantly from the early experimental terms and then returned to the same level of controls through the late experimental terms. 2. The activity of nonspecific esterase(NSE) of the constituent cells with exception of the lymphocytes in BF, thymus and spleen of experiments were increased significantly from the early experimental terms and then returned to the same level of control through the late experimental terms. 3. The lymphocyte percentage, total erythrocytes and homoglobin of the experiments were severely decreased from early experimental terms and then increased to the normal levels of them incontrols.

• 대한방사선기술학회지:방사선기술과학
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• 제4권1호
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• pp.63-71
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• 1981

The metal-plates(Aluminium. Copper, Lead) of change the variation thickness have been penetrated by the collimated beam($450mm{\times}4mm{\phi}$) of Gamma-ray from $^{192}Ir$. Then, the scattered $\gamma$-ray dose in variable angle and the directly transmitted $\gamma$-ray dose were measured using the electrometer of ionization chamber. The results were summarized as follows: 1. Obtained the mass attenuation coefficients of $Al;0.0937cm^2g^{-1},\;Cu;0.0937cm^2g^{-1},\;pb;0.244cm^2g^{-1}$. 2. Total intensity of front scattered $\gamma$-ray follow the order of Al>Cu>pb. 3. The scattered $\gamma$-ray intensity with the lager angle of scattering was saturated after increase rapidly, and the scattering angle of the more larger was decreased. 4. The scattered $\gamma$-ray intensity through plates of aluminium or copper was saturated after increase with thicker scatterer, and the intensity was decreased at the more thicker. But the variation of scattered $\gamma$-ray dose in the lead plate made the fewest than Al and Cu. 5. The ratio of the scattered $\gamma$-ray dose and the directly transmitted $\gamma$-ray dose was saturated after increase with the thicker scatterer, and the scatterer of the more thicker was decreased. Degree of total intensity in these ratios was followed the order of Cu>Al>Pb.

• Journal of Radiation Protection and Research
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• 제19권2호
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• pp.121-132
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• 1994

본 연구는 대구지역의 지각 ${\gamma}$-선에 의한 조사선량율을 측정하고 그에 따른 성분별 공간선량율 및 지역적 분포 등의 환경방사선 특성을 조사하였다. ${\gamma}$-선 스펙트럼의 측정에는 $4^{'}{\phi}{\times}4^{'}$ NaI(T1) 계측기와 휴대용 다중파고분석장치를 이용하여 이 지역내의 28개 지점에서 in-situ spectrometry를 수행하였으며, 측정된 스펙트럼으로부터 조사선량율을 환산하여 지각 ${\gamma}$-선의 총선량율과 일반적으로 자연방사능의 주종이 되는 $^{40}K,\;^{238}U$ 계열 및 $^{232}Th$계열의 성분별 조사 선량율을 구하였다. 조사결과 대구지역의 지각 ${\gamma}$-선에 의한 평균조사선량율은 $9.4{\mu}R/h$였으며 지점별 분포는 $7.6{\sim}11.0{\mu}R/h$ 범위로 다소 차이를 보였다. 측정시에 수반되는 기후나 우주선 등에 따른 일 변화폭을 고려한다면 지점간의 차이는 주로 표토층의 자연방사성핵종인 $^{40}K,\;^{238}U$계열 및 $^{232}Th$ 계열의 핵종에 기인함을 알 수 있었으며, 성분별 선량율은 $^{40}K\;2.9{\sim}4.6{\mu}R/h,\;^{238}U$ 계열 $1.2{\sim}3,\;1{\mu}R/h,\;^{232}Th$ 계열 $2.5{\sim}5.0{\mu}R/h$의 분포를 나타냈다.

• Radiation Oncology Journal
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• 제1권1호
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• pp.21-24
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• 1983

Co ${\gamma}$선과 10MV x선으로 폴리스티렌 팬톰에 조사하여 이온함으로 배면과 배면근처의 선량을 측정한 결과는 아래와 같다. 1. 측정점 이하의 팬톰의 두께가 증가함에 따라 선량율과 선량보정계수가 증가하였으며 그 두께가 20cm 이상인 경우에는 일정하였다. 선량보정계수는 1 이하였다. 2. 조사면의 크기가 클수록, 측정점의 깊이가 깊을 수록 선량보정계수는 감소하였다. 3. 선량에 후방산란선량의 기여도는 조사면이 클수록, 깊이가 얕을수록, 그 깊이 이하의 물질의 두께가 두꺼울수록 증가하였다. 4. 10MV x선의 경우에도 선량보정계수는 같은 유형으로 변하기는 했지만 그 값이 0.995~1.000이었다. 5. $^{60}Co$에 경우에 치료부위의 두께가 10cm 이상이면 조사시간을 보정하지 않아도 좋을 것이다.