Patent Number: 
Section: claims

1. A rotatable and replaceable plunger type multi-source radiator comprising a radiation source shield, plural shield cavities, a rotatable radiation source selection device, a radiation aperture, one or plural plunger pipes, one or plural radiation source rod, one or plural radiation source box, one or plural radiation sources, a mechanical arm, a positioning lever device, a control device, a radiation aperture, and a reserve radiation location, wherein the radiation source rod consists of a handle, a packing gland, a top shield, a radiation source box and a bottom shield, wherein the control device consists of a timer, a displacement controller and a CPU. 2. The rotatable and replaceable plunger type multi-source radiator according to claim 1, wherein the radiation source shield and the rotatable radiation source selection device form a main block of radiation sources, wherein the shield cavity is formed on the radiation source shield for accommodating the rotatable radiation source selection device, a radiation aperture formed on left side of the main block for radiation, and bottom side of the main block kept hollowed for routing transmission lines. 3. The rotatable and replaceable plunger type multi-source radiator according to claim 1, wherein the rotatable radiation source selection device containing one or plural plunger pipes in an annular and symmetrical configuration with its center is inserted from top into the cavity of the radiation source shield for ease of loading and unloading radiation source rods. 4. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the radiation source rod comprising a handle, a packing gland, top shield, a radiation source box, bottom shield may be inserted in the plunger pipe directly. 5. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the radiation aperture with staircases may use the shield beneath the radiation source rod to prevent leakage and interference from the other radiation sources within the radiation source rod. 6. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the mechanical arm is used for moving the radiation source rod up and down for positioning the radiation source in alignment with the radiation aperture. 7. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the radiation source shield, the rotatable radiation source selection device and the radiation source rod use heavy metal material covered with iron plate. 8. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the radiation source selection device may be adjusted in precision with the positioning lever device. 9. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the mechanical arm is capable of returning to the reserve radiation location by gravitation while a power failure occurred. 10. The plunger type rotatable and replaceable multi-source radiator according to claim 1, wherein the control device is used to command the exposure time of the radiation source and to start the operation of the radiation source selection device and the mechanical arm.