266 



MUTATION AND PLANT BREEDING 



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The Gamma Station at Bats ga'rd " ' v 



Figure 2. — Plan of the new gamma irradiation field at Balsgard, Sweden. 



plants, we are going to concentrate on acute or semi-chronic expo- 

 sures. Therefore, we have made the field as small as possible in order 

 to save space. The strength of the source is now 40 curies, which seems 

 suitable for our purposes. It is enclosed in a lead container sur- 

 rounded by a ring-shaped soil wall. The source may be lifted up out 

 of the container, which may also be used as a transport container, by 

 means of an oil piston. A small hand-driven oil pump is placed, 

 together with control lamps, in a box at the gate. The plexiglass tube 

 above the container houses the oil piston. 



