Patent Number: 
Section: claims

1. A body composition, comprising:boron in an amount of 21-41 atomic percent (at %);iron in an amount of 25-35 at %;chromium in an amount of 2-4 at %;carbon in an amount of 3-10 at %; anda balance of tungsten of the body composition,wherein at least 95 at % of the Fe is in the form of a boride, an intermetallic boride or an intermetallic carbide. 2. The body composition according to claim 1, wherein at least 95 at % of the Cr is in the form of a boride, an intermetallic boride or an intermetallic carbide. 3. The body composition according to claim 1, wherein less than 5 at % of the Fe is in the form of FeCr. 4. A method of producing a body composition, comprising:providing one or ore powders comprising B, Fe, Cr, C and W;milling the one or more powders with an organic binder to obtain a powder mixture;pressing the milled powder mixture; andsintering the pressed powder mixture to obtain a sintered body,wherein the one or more powders comprising the B, the Fe, the Cr, the C and the W includeboron in an amount of 21-41 atomic percent (at %);iron in an amount of 25-35 at %;chromium in an amount of 2-4 at %;carbon in an amount of 3-10 at %; anda balance of tungsten of the body composition,wherein at least 95 at % of the Fe is in the form of a boride, an intermetallic boride or an intermetallic carbide. 5. The method according to claim 4, wherein the sintering step is a reactive sintering process. 6. The method according to claim 4, wherein the boron is added in the form of B4C. 7. The method according to claim 4, wherein the iron and the chromium are added in the form of FeCr. 8. The method according to claim 4, wherein the W is added in the form of W and optionally WC. 9. The method according to claim 8, wherein the amount of the WC added is less than 5 wt %. 10. A method of manufacturing an object for nuclear shielding in a nuclear reactor, comprising:preparing a body composition comprisingboron in an amount of 21-41 atomic percent (at %);iron in an amount of 25-35 at %;chromium in an amount of 2-4 at %;carbon in an amount of 3-10 at %; anda balance of tungsten of the body composition,wherein at least 95 at % of the Fe is in the form of a boride, an intermetallic boride or an intermetallic carbide. 11. A body composition, comprising:boron in an amount of 21-41 atomic percent (at %);iron in an amount of 25-35 at %;chromium in an amount of 2-4 at %;carbon in an amount of 3-10 at %; anda balance of tungsten of the body composition,wherein at least 95 at % of the Cr is in the form of a boride, an intermetallic boride or an intermetallic carbide. 12. The body composition according to claim 11, wherein at least 95 at % of the Fe is in the form of a boride, an intermetallic boride or an intermetallic carbide. 13. The body composition according to claim 11, wherein less than 5 at % of the Fe is in the form of FeCr. 14. A body composition, comprising:boron in an amount of 21-41 atomic percent (at %);iron in an amount of 25-35 at %;chromium in an amount of 2-4 at %;carbon in an amount of 3-10 at %; anda balance of tungsten of the body composition,wherein less than 5 at % of the Fe is in the form of FeCr. 15. The body composition according to claim 14, wherein at least 95 at % of the Fe is in the form of a boride, an intermetallic boride or an intermetallic carbide. 16. The body composition according to claim 14, wherein at least 95 at % of the Cr is in the form of a boride, an intermetallic boride or an intermetallic carbide.