巻号一覧
16 巻 (1981)
- 4 号 p. 277-
- 3 号 p. 201-
- 2 号 p. 83-
- 1 号 p. 1-
16 巻, 1 号
選択された号の論文の10件中1～10を表示しています
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長岡 鋭, 坂本 隆一, 斎藤 公明, 森内 茂1981 年 16 巻 1 号 p. 1-10
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーAngular distributions of exposure rate in natural radiation environment were measured using a 1″φ×1″ NaI (Tl) scintillation detector which was placed on the axis of a set of concentric circular lead shieldings. Incident polar angle of γ ray was determined by changing the relative position between the detector and the shieldings. Incident γ rays were integrated over the whole azimuthal angle (0-2π) in each polar angle. And then, the angular distribution was obtained by subtracting the responses between each polar angle.
As the incident solid angle of γ ray could be set large enough, it was possible not only to set the measuring time short but also to measure with high accuracy.
Measurements were made under various environmental conditions; two on open field and one in a pine grove at a height of 1m, and one at a height of 10m on a tower. And also, one measurement was made in a one-storied wooden house. Experimental results supported the angular distributions expected from calculations, previously reported by other authors, and it was shown that this method can be applied well even where a calculational evaluation is difficult due to the complexity of its topography.抄録全体を表示PDF形式でダウンロード (2370K) -
福井 正美, 内田 滋夫, 桂山 幸典1981 年 16 巻 1 号 p. 11-21
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーStudies were conducted to estimate the contamination spread resulting from the radioactive waste disposal into a subsurface aquifer. A general equation, expressing the contaminated zone as a function of radioactive decay, the physical and chemical parameters of soil is presented. A distribution coefficient was also formulated which can be used to judge the suitability of a site for waste disposal. Moreover, a method for predicting contaminant concentration in groundwater at a site boundary is suggested for a heterogeneous media where the subsurface aquifer has different values of porosity, density, flow velocity, distribution coefficient and so on.
A general equation was also developed to predict the distribution of radionuclides resulting from the disposal of a solid waste material. The distributions of contamination was evaluated for 90Sr and 239Pu which obey a linear adsorption model and a first order kinetics respectively. These equations appear to have practical utility for easily estimating groundwater contamination.抄録全体を表示PDF形式でダウンロード (1370K) -
下 道国, 上田 淳一, 池辺 幸正1981 年 16 巻 1 号 p. 23-32
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーMeasurements of the size distribution of naturally occuring radioactive aerosols (short-lived radon daughters) have been carried out by a diffusion battery method in a tunnel. Three kinds of analytical methods —log-normal method, response matrix method, and graphical stripping method— were applied to the estimation of a size distribubution from observed relationships between radioactivity and flow rate. The activity distributions obtained were almost equal in form and also equal to those which were estimated from non-radioactive particle size distributions measured simultaneously.抄録全体を表示PDF形式でダウンロード (1174K) -
石黒 秀治1981 年 16 巻 1 号 p. 33-38
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーData processing system of personnel exposure was developed at PNC Tokai Works. This system consists of host and terminal computer system with four character displays. Data multi-check system and ease of operation were considered in the design of this system.
This system has two main functions: the first is the storage of all personnel exposure data in PNC and the second is the semi-automatic processing of thermoluminescence values measured by manual TLD readers.
All TL elements in the TLD badges for whole body exposure and the finger rings for extremity exposure are measured by three manual TLD readers and simultaneously the results are sent to computer system by means of three character displays.
This system is availabe to the applications for the national registration center.抄録全体を表示PDF形式でダウンロード (746K) -
松田 秀晴, 古川 滋子, 上西 時司1981 年 16 巻 1 号 p. 39-42
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (444K) -
山県 登, 西村 耕一, 橋本 丈夫1981 年 16 巻 1 号 p. 43-50
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーIn connection with the operation of the first spent fuel reprocessing plant in Japan, the monitoring of marine sediment off the coast of Tokai-mura is needed to detect the influence of radioactive effluent from the plant. However, some projects of point-sampling of marine sediment in this area have revealed a wide range of variation from place to place in the concentrations of fallout radionuclides distributed by nuclear weapons tests. Accordingly, a sampling design to detect any significant change by year of environmental levels of radionuclides in sediment should involve the sampling of sediment from a number of point in order to satisfy a given confidence level. A new method of line-sampling has been developed as a substitute for point-sampling at many points. The principle of this method comprised of resuspension of sediment by dragging a muddler on the bottom and collection of suspended sediment by a net type collector set up on a sledge. Operation of line-sampling by use of this apparatus and point-sampling by use of Smith-McIntyre grab sampler were made at two locations of different type and comparison of the analytical data for collected sediment was made. The sampling off Tokaimura (open sea, sandy sediment), where 137Cs was analyzed, showed a good coincidence between the two method, while the sampling in Urazoko-bay (silty sediment), where both 137Cs and 60Co were analyzed, showed a discrepancy suggesting a loss of fine silty sediment in the line-sampling method.抄録全体を表示PDF形式でダウンロード (2272K) -
小泉 勝三, 石黒 秀治, 福田 整司1981 年 16 巻 1 号 p. 51-59
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーCommitted dose equivalent for inhaled 239Pu was calculated on the basis of the method given by ICRP publication 30. The procedures were presented for the calculation of the total quantity of activity in each compartment of respiratory system and several organs at time t and for the calculation of the integrated dose equivalent in several organs by single intake due to 239Pu inhalation.
In order to apply to the monitorng of internal exposure, dependence of the committed dose equivalent on particle size (AMAD) and of activity in excreted feces on particle size (AMAD) was examined for inhaled 239Pu class Y and class W, respectively. By using the results obtained, the inhaled 239Pu is determined by the measurement of the activity in excreted feces.抄録全体を表示PDF形式でダウンロード (860K) -
放射線観測車による走行時サーベイのデータ収集自動記録装置の試作小林 秀雄1981 年 16 巻 1 号 p. 61-63
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (272K) -
1981 年 16 巻 1 号 p. 81a-82
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (147K) -
1981 年 16 巻 1 号 p. 81b-82
発行日: 1981年
公開日: 2010/02/25
ジャーナル フリーPDF形式でダウンロード (147K)
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