Patent Number: 
Section: claims

1. A system comprising:a transparent radiation shield comprising a container holding a transparent ammonium metatungstate solution, the transparent ammonium metatungstate solution having a density of greater than 1.5 grams/(cubic centimeter). 2. The system of claim 1, wherein:the transparent radiation shield is installed on mechanical or industrial equipment. 3. The system of claim 1, wherein:the transparent radiation shield is installed on medical equipment or facility. 4. The system of claim 1, wherein:the transparent radiation shield is wearable by a human. 5. A method comprising:placing an ammonium metatungstate solution with a density of approximately 2.35 grams/(cubic centimeter) in a container of a transparent radiation shield. 6. The method of claim 5, wherein:making the ammonium metatungstate solution by adding ammonium metatungstate powder in an amount greater than 1.5 grams per milliliter of water. 7. The method of claim 5, further comprising:making the ammonium metatungstate solution by adding an ammonium metatungstate powder in installments to a mixing vessel comprising water; andmixing the ammonium metatungstate powder with the water between installments. 8. The method of claim 5, further comprising:making the ammonium metatungstate solution by mixing the ammonium metatungstate solution in a mixing vessel for a predetermined time period. 9. The method of claim 5, further comprising:making the ammonium metatungstate solution by adjusting temperature in a mixing vessel. 10. The method of claim 5, further comprising:making the ammonium metatungstate solution by adjusting a rotational speed of a mixer in a mixing vessel. 11. The method of claim 5, further comprising:making the ammonium metatungstate solution by adjusting temperature in a mixing vessel to between 14° C. and 99° C. 12. The method of claim 5, further comprising:making the ammonium metatungstate solution by adjusting pH in a mixing vessel comprising ammonium metatungstate powder and water. 13. The method of claim 5, further comprising:making the ammonium metatungstate solution by adjusting pH in a mixing vessel comprising ammonium metatungstate powder and water to a level between 2.0 and 4.5. 14. The method of claim 5, further comprising:making the ammonium metatungstate solution by adding nitric acid to a mixing vessel comprising ammonium metatungstate powder and water. 15. The method of claim 5, further comprising:making the ammonium metatungstate solution by causing transfer of the ammonium metatungstate solution from a first container to a second container substantially without exposing the ammonium metatungstate solution to air. 16. A radiation shield comprising a container holding an ammonium metatungstate solution with a density of greater than 1.5 grams/(cubic centimeter), wherein the ammonium metatungstate solution is filtered to remove particles greater than 15 microns in size. 17. The radiation shield of claim 16, wherein:the ammonium metatungstate solution has a Raman spectra with peaks at approximately 884 cm−1, approximately 923 cm−1, and approximately 972 cm−1. 18. The radiation shield of claim 16, wherein:the ammonium metatungstate solution comprises greater than 30% tungsten by weight. 19. The radiation shield of claim 16, wherein:the ammonium metatungstate solution has a gamma ray mass attenuation coefficient of at least 0.06 (square centimeters)/gram. 20. The radiation shield of claim 16, wherein:the container is a polycarbonate container, which provides an effective barrier to penetration of any alpha particle, beta particle, gamma ray, bremsstrahlung, and other secondary radiation.