| 摘要 |
<p>1,063,726. Irradiation apparatus. COMMISSARIAT A L'ENERGIE ATOMIQUE. April 7, 1965 [April 7, 1964], No. 14716/65. Heading H5R. Apparatus for moving a radio-active source 1 from a storage position to an irradiation position by pneumatic means, comprises a tubular conduit 2, 18 (Fig. 5) made up of three sections to allow rotation of at least the irradiation end section about the axis of the central section. In the storage position the source is seated in the end of a cylindrical conduit (18, Fig. 3, not shown), fitted with a closure plug (22) and a microswitch (23) which is actuated by the presence of the source on the spring contact (21). The inputs from the compressor and outputs for the pneumatic fluid (air) are located adjacent the central section (11) of the conduit (Figs. 2, 4, not shown). To remove the source 1 from the storage position, air from the compressor is supplied to the annular space between the storage conduit section 18 and its outer jacket (19) through a line 28 and tube 40, driving the source past the highest point of the tube section 18, from where it drops under gravity to the irradiation end 2 of the conduit, where air cushions its fall on to seat (6) also provided with a microswitch (8) &c. To return the source to storage, compressed air is pumped through line 25 into the annular chamber (13) between central conduit section (11) and its outer jacket (12) from where the air travels along a tube (5) to the annular chamber (4) between the irradiation conduit section (2) and its outer jacket (3) to force the the source 1 upwards. The air is vented to the atmosphere, in both cases, through passages (35, 36) and a tube (37) arranged near the central section (11). A number of such tubular conduits may be used in an irradiation plant for cereals such as wheat or maize (Fig. 7, not shown). The conduit members (e.g. 51, 52) are located near the bottom of a hole in a concrete shield. Cereal from a silo (41) is passed into a chamber (46) arranged to produce a downward moving curtain of material for irradiation, the irradiation end sections (53) of the tubular conduits being swivelled round adjacent the chamber by means of a motor drive (55) or transmission systems (57).</p> |
