Method and device for radiotherapy

1. A method of manufacturing a radiotherapy device, the method comprising:

providing a probe having a surface, and adapted for being at least partially introduced into a body of a subject;

positioning said surface in a flux of a radionuclide selected from the group consisting of Radium-223 and Radium-224; and

collecting atoms of said radionuclide to retainably embed said atoms on or beneath said surface, in a manner that a natural recoil energy of daughter nuclei of the radionuclide is sufficient to allow the daughter nuclei to escape the surface, so that said radionuclide remains in said probe while a therapeutic dose of decay chain nuclei and alpha particles of said radionuclide is emitted outside said surface, thereby manufacturing the radiotherapy device; and

coating said surface by a protective coat.

2. The method of claim 1 , wherein said collecting is by direct implantation in a vacuum.

3. The method of claim 1 , wherein said collecting is by connecting said surface to a voltage source of negative polarity.

4. The method of claim 3 , wherein said positioning of said surface in said flux of said radionuclide is in a gaseous environment.

5. The method of claim 3 , wherein a pressure of said gaseous environment and a voltage of said voltage source are selected such that a velocity of nuclei is reduced to a thermal velocity.

6. The method of claim 1 , wherein said probe is selected such that the device is removably implantable in a body of a subject.

7. The method of claim 1 , wherein said probe comprises at least one needle.

8. The method of claim 1 , wherein said probe comprises at least one bead.

9. The method of claim 1 , wherein said probe is a tip of an endoscope.

10. The method of claim 1 , wherein said probe is a tip of a laparoscope.

11. The method of claim 1 , wherein said probe is a tip of an imaging device.

12. The method of claim 1 , wherein said probe comprises an inner elongated member and an outer tubular member having a mouth section configured for receiving said inner elongated member, said inner elongated member being movable within said outer tubular member and having a distal end and a proximal end, whereby said radionuclide is collected on or beneath a surface of said distal end.

13. The method of claim 1 , wherein at least one of a thickness and a material of said protective coat is selected so as not to prevent emission of decay chain nuclei and alpha particles from said surface of said probe.

14. The method of claim 1 , wherein said probe is capable of administering from about 100 rem to about 100000 rem of radiation dose.

15. The method of claim 1 , wherein an activity of said radionuclide is from about 10 nanoCurie to about 10 microCurie.

16. The method of claim 1 , wherein the probe comprises an elongated member.

17. The method of claim 16 , wherein the probe comprises a tubular member.

18. The method of claim 1 , wherein the protective coat has a thickness of about 5 nanometers.

19. The method of claim 1 , wherein providing the probe comprises providing a probe having an outer layer made of a porous material.

20. The method of claim 1 , wherein collecting atoms of the radionuclide to retainably embed the atoms on or beneath the surface comprises collecting atoms of the radionuclide to retainably embed the atoms at a depth of the order of about 10 nanometers.

21. The method of claim 1 , wherein collecting the atoms comprises collecting the atoms on or beneath said surface, with a surface density of between about 10 10 to about 10 13 atoms/cm 2 .