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There is disclosed a fluid treatment device comprising a housing for receiving a flow of fluid. The housing comprises a fluid inlet, a fluid outlet, a closed fluid treatment zone disposed between the fluid inlet and the fluid outlet. Disposed in the housing is at least one elongate radiation source

There is disclosed a fluid treatment device comprising a housing for receiving a flow of fluid. The housing comprises a fluid inlet, a fluid outlet, a closed fluid treatment zone disposed between the fluid inlet and the fluid outlet. Disposed in the housing is at least one elongate radiation source assembly having a longitudinal axis disposed in the fluid treatment zone substantially parallel to a direction of the flow of fluid through the housing. The radiation source assembly comprises an elongate radiation source disposed in a protective sleeve to define a substantially annular passageway. The protective sleeve has opposed open ends configured to permit heat to exit the passageway and the housing through at least one of the opposed open ends of the sleeve.

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What is claimed is: 1. A fluid treatment system comprising: a housing for receiving a flow of fluid, the housing comprising a fluid inlet, a fluid outlet, a closed fluid treatment zone disposed between the fluid inlet and the fluid outlet, and at least one elongate radiation source assembly having

What is claimed is: 1. A fluid treatment system comprising: a housing for receiving a flow of fluid, the housing comprising a fluid inlet, a fluid outlet, a closed fluid treatment zone disposed between the fluid inlet and the fluid outlet, and at least one elongate radiation source assembly having a longitudinal axis disposed in the fluid treatment zone substantially parallel to a direction of the flow of fluid through the housing; and wherein the radiation source assembly comprises an elongate radiation source disposed in a protective sleeve to define a substantially annular passageway, the protective sleeve having opposed open ends configured to permit heat to exit the passageway and the housing through at least one of the opposed open ends of the sleeve, both ends of the radiation source being disposed within the housing. 2. The fluid treatment system defined in claim 1, wherein the radiation source comprises an electrical connection only at one end thereof. 3. The fluid treatment system defined in claim 1, wherein a proximal end of the radiation source comprises a first locator portion configured to position a proximal end of the radiation source to be substantially concentric with respect to a proximal end of the protective sleeve. 4. The fluid treatment system defined in claim 3, wherein the first locator portion comprises a pair of apertures configured to receive a pair electrical contact elements of the radiation source. 5. The fluid treatment system defined in claim 4, wherein the first locator portion further comprises a barrier portion disposed between the pair of apertures and configured to reduce arcing between the pair of electrical contact elements of the radiation source. 6. The fluid treatment system defined in claim 3, wherein the first locator portion comprises a plurality of first finger portions to position a proximal end of the radiation source to be substantially concentric with respect to a proximal end of the protective sleeve. 7. The fluid treatment system defined in claim 6, further comprising a sleeve bolt for receiving at least one of the plurality of first finger portions in locked position, the sleeve bolt configured to be removably connected to the housing. 8. The fluid treatment system defined in claim 7, wherein the sleeve bolt is configured to be connection to an electrical connection harness only when at least one of the plurality of first finger portions is in a locked position in the sleeve bolt. 9. The fluid treatment system defined in claim 1, wherein the radiation source comprises a metal amalgam composition on an interior surface thereof. 10. The fluid treatment system defined in claim 9, wherein the metal amalgam composition comprises a mercury amalgam composition. 11. The fluid treatment system defined in claim 9, wherein the metal amalgam composition is disposed near a proximal end of the radiation source. 12. The fluid treatment system defined in claim 9, wherein the metal amalgam composition is disposed near a distal end of the radiation source. 13. A fluid treatment system, comprising: a housing for receiving a flow of fluid, the housing comprising a fluid inlet, a fluid outlet, a closed fluid treatment zone disposed between the fluid inlet and the fluid outlet, and at least one elongate radiation source assembly having a longitudinal axis disposed in the fluid treatment zone substantially parallel to a direction of the flow of fluid through the housing; and wherein the radiation source assembly comprises an elongate radiation source disposed in a protective sleeve to define a substantially annular passageway, the protective sleeve having opposed open ends configured to permit heat to exit the passageway and the housing through at least one of the opposed open ends of the sleeve, wherein a proximal end of the radiation source comprises a first locator portion configured to position a proximal end of the radiation source to be substantially concentric with respect to a proximal end of the protective sleeve, and wherein a distal end of the radiation source comprises a second locator portion configured to position a distal end of the radiation source to be substantially concentric with respect to a distal end of the protective sleeve. 14. The fluid treatment system defined in claim 13, wherein the second locator portion comprises a plurality of second finger portions to position a distal end of the radiation source to be substantially concentric with respect to a distal end of the protective sleeve. 15. The fluid treatment system defined in claim 13, wherein the second locator portion comprises an open region substantially aligned with a metal amalgam composition disposed on an interior of the radiation source. 16. The fluid treatment system defined in claim 15, wherein the open region has a shape comprising a closed perimeter. 17. The fluid treatment system defined in claim 15, wherein the open region has a shape comprising an open perimeter. 18. The fluid treatment system defined in claim 13, wherein the second locator portion comprises a pair movable sections configured to be movable between a first position in which the open region is obscured and a second position in which the open region is in a fully open position. 19. The fluid treatment system defined in claim 18, wherein the pair of movable sections is coaxially arranged and rotatable with respect to one another. 20. The fluid treatment system defined in claim 13, wherein the second locator portion comprises a pair movable sections configured to be movable between a first position in which the open region is obscured, at least one intermediate position in which the open region is partially open and a second position in which the open region is in a fully open position. 21. The fluid treatment system defined in claim 13, wherein the second locator portion comprises a pair movable sections configured to be movable between a first position in which the open region is obscured, a plurality of intermediate positions in which the open region is partially open and a second position in which the open region is in a fully open position. 22. The fluid treatment system defined in claim 21, wherein each of the movable sections comprises an open section. 23. The fluid treatment system defined in claim 22, wherein the open section in each movable section has substantially the same shape. 24. The fluid treatment system defined in claim 22, wherein the open section in each movable section has a different shape. 25. The fluid treatment system defined in claim 22, wherein the open section is configured such that the change in surface area of the open region from one intermediate position to another intermediate position is linearly dependent on the degree of relative movement of the movable sections. 26. The fluid treatment system defined in claim 22, wherein the open section is configured such that the change in surface area of the open region from one intermediate position to another intermediate position is non-linearly dependent on the degree of relative movement of the movable sections. 27. The fluid treatment system defined in claim 13, wherein the second locator portion comprises an end cap for receiving a distal end of the radiation source. 28. The fluid treatment system defined in claim 27, wherein the end cap is open. 29. The fluid treatment system defined in claim 27, wherein the end cap is closed.