巻号一覧
2 巻
選択された号の論文の5件中1～5を表示しています
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相沢 幸一, 三箇 善雄, 中島 孝和, 真保 極1961 年 2 巻 p. 1-3
発行日: 1961年
公開日: 2010/10/21
ジャーナル フリーWe have a routine roentgenographic examination to a group of 299 children once every year. While in the examination, we came across the development of a dentigerous cyst on the left upper second premolar on one of the children and were fortunate enough to study its mechanism.
His X-ray photogram taken at 5 years and 9 months as well as at 6 years and 9 months revealed no abnormality, but those of 7 years and 9 months showed a fairly clear state of bone resortpion around the crown tissues of 5 and the apical portion of V. After one year (at 8 years and 9 months), there was a complete formation of dentigerous cyst roentgenographically detected in the locality specified above.抄録全体を表示PDF形式でダウンロード (3739K) -
山本 昭1961 年 2 巻 p. 4-8
発行日: 1961年
公開日: 2011/06/03
ジャーナル フリー1) The intensity of the primary radiation and the spacial distribution of scatttered radiations from soft X-ray apparatus with the micawindow tube (Softex Type E) were measured.
2) Under the condition of 26 kVp (Tap 3), 10 mA, the intensity of the primary radiation was measured by Victoreen chamber (Model 651), and its value was 8.6 r/sec. (F. C.D. = 30 cm.) in air.
3) The scattered radiations were measured with Portable Electrometer. This Electrometer was designed for the measurement of the scattered radiation. However, the reading of this Portable Electrometer indicated the dose rate to only 60% of the value that was obtained with Victoreen soft X-ray chamber (Model 651). Measurement was made at the distance of 40 cm from the focus on the frontal and lateral sides of the apparatus at the height of focal spot and the direction of the X-ray beam was fixed vertically. The results were as follows:
Lateral sides left side of the apparatus: 0.54 mr/sec. (the anodal side) right side of the apparatus: 0.39 mr/sec. (the cathodal side) Frontal side: 0.46 mr/sec.
4) The scattered radiation intensity could be decreased to 1/6 by surrounding the useful beam with a thin copper plate (thickness = 0.3 mm.).
5) It will be possible to bring out considerable hazards in operating the soft X-ray apparatus without using any protective measure. In operating the soft X-ray apparatus, however, we can avoid the radiation hazards more easily than in operating the conventional diagnostic X-ray apparatus.抄録全体を表示PDF形式でダウンロード (1806K) -
片山 昌春1961 年 2 巻 p. 9-12
発行日: 1961年
公開日: 2010/10/21
ジャーナル フリーComparing the various dental films made in West Germany with those made in Japan, the author has obtained following results. The german made films have better properties than the domestic ones. A higher gamma value, better transparency of film base and negligible fog effect are the few noted reason.抄録全体を表示PDF形式でダウンロード (285K) -
1961 年 2 巻 p. 13-46
発行日: 1961年
公開日: 2011/06/03
ジャーナル フリーPDF形式でダウンロード (13920K) -
1961 年 2 巻 p. 47-48
発行日: 1961年
公開日: 2010/10/21
ジャーナル フリーPDF形式でダウンロード (137K)
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