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Type:
Educational Exhibit
Keywords:
Radiation physics, Radioprotection / Radiation dose, Experimental, Radiation effects, Education and training
Authors:
H. Hayashi, N. Kimoto, H. Okino, K. Takegami, I. Maehata, Y. Kanazawa; Tokushima/JP
DOI:
10.1594/ecr2016/C-0083
Background
Figure 2 shows photographs of a newly developed leaf electroscope. The left photograph shows a side view of the apparatus. The outer size is 130 mm width,
130 mm length and 170 mm height. The main body of the apparatus is made of 10 mm thick polycarbonate. X-rays are introduced from the left side.
The entrance window has a100 mm width and 90 mm height,
and the thickness is 5 mm. To shield scattered X-rays from the movable diaphragm [5-7],
the left side of the upper detection space is covered with 2 mm of lead.
In the front,
we can see a pressure sensor and a socket which is used to connect a vacuum pump. The top left photograph demonstrates an upper plate having leaves. To establish a vacuum,
an O-ring was set in the upper plate. From the top,
two types of separators can be inserted; one is a solid plate (polycarbonate),
and the other is metal-mesh. The top right photograph demonstrates how to insert the separator. The right bottom photograph shows all materials used in our experiment.
The experiments were performed with the following four settings; a) normal (at 1 atm),
b) with solid separator,
c) with metal-mesh separator,
and d) under vacuum (0.2 atm).
Figure 3 shows the experimental setup. Diagnostic X-ray equipment (Toshiba medical systems,
Japan) was used. Tube voltage was set at 40 kV.
Source to apparatus distance was set at 47 cm. The irradiation field was 10 cm width and 9 cm height on the surface of the apparatus. Tube-current-time products were 10 mAs and 20 mAs.