Patent Number: 
Section: claims

1. A radiation system comprising:a gantry comprising:a static gantry part; anda movable gantry part movably supported by said static gantry part;a radiation head mechanically supported by said movable gantry part and being movable relative said static gantry part in a dedicated spacing in a radiation-shielding separating member between a first position for directing a radiation beam into a first treatment room and a second position for directing said radiation beam into a second treatment room, said separating member separating at least said first treatment room and said second treatment room; anda movable radiation shielding being a part of said movable gantry part and preventing radiation from reaching said second treatment room when said radiation head is in said first position and preventing radiation from reaching said first treatment room when said radiation head is in said second position. 2. The radiation system according to claim 1, wherein said static gantry part is adapted for arrangement in a radiation-shielding separating member. 3. The radiation system according to claim 1, wherein said static gantry part is adapted for partly being arranged in said radiation-shielding separating member separating at least said first treatment room and said second treatment room. 4. The radiation system according to claim 1, wherein said static gantry part is adapted for arrangement in said radiation-shielding separating member separating at least said first treatment room and said second treatment room. 5. The radiation system according to claim 1, wherein said separating member is selected from at least one of:a radiation-shielding partition between said first and second treatment room;a radiation-shielding ceiling-floor pair between said first and second treatment room, said first and second treatment room being positioned at different floors. 6. The radiation system according to claim 1, further comprising at least one radiation simulation head, said simulation head being able to direct a radiation simulation beam into said first treatment room simultaneously as said radiation head directs said radiation beam into said second treatment room. 7. The radiation system according to claim 6, wherein said radiation simulation head is movable on said gantry between said first and second treatment room. 8. The radiation system according to claim 6, wherein said radiation head is adapted for providing a treatment beam and said radiation simulation head is adapted for providing a treatment simulation beam. 9. The radiation system according to claim 1, further comprising:a second gantry adapted for arrangement in connection with at least said second treatment room and a third treatment room separated by a radiation-shielding separating member; anda second radiation head mechanically supported by said second gantry, said second radiation head being movable relative said second gantry between a first position for directing a radiation beam into said second treatment room and a second position for directing said radiation beam into said third treatment room. 10. The radiation system according to claim 9, wherein said radiation head and said second radiation head are configured for directing said radiation beams into said second treatment room from different incident angles. 11. The radiation system according to claim 9, further comprising a radiation beam splitter for simultaneously providing radiation from a common radiation source to said first gantry and to said second gantry. 12. The radiation system according to claim 2, wherein said static gantry part is adapted for partly being arranged in said radiation-shielding separating member separating at least said first treatment room and said second treatment room. 13. The radiation system according to claim 7, wherein said radiation head is adapted for providing a treatment beam and said radiation simulation head is adapted for providing a treatment simulation beam. 14. The radiation system according to claim 10, further comprising a radiation beam splitter for simultaneously providing radiation from a common radiation source to said first gantry and to said second gantry.