Context: Depleted uranium is also used as a shielding material in some containers used to store and transport radioactive materials. While the metal itself is radioactive, its high density makes it more effective than lead in halting radiation from strong sources such as radium. Other uses of depleted uranium include counterweights for aircraft control surfaces, as ballast for missile re-entry vehicles and as a shielding material. Due to its high density, this material is found in inertial guidance systems and in gyroscopic compasses. Depleted uranium is preferred over similarly dense metals due to its ability to be easily machined and cast as well as its relatively low cost. The main risk of exposure to depleted uranium is chemical poisoning by uranium oxide rather than radioactivity (uranium being only a weak alpha emitter).

Question: What kind of uranium is sometimes used to shield radioactive materials in containers?
Answer: Depleted

Question: What is a strong source of radiation that is blocked by depleted uranium?
Answer: radium

Question: How is depleted uranium used in missile re-entry vehicles?
Answer: ballast

Question: What trait causes depleted uranium to be used in gyroscopic compasses?
Answer: high density

Question: What type of alpha emitter is uranium?
Answer: weak

Question: What kind of uranium is always used to shield radioactive materials in containers?
Answer: Unanswerable

Question: What is a weak source of radiation that is blocked by depleted uranium?
Answer: Unanswerable

Question: How is depleted uranium not used in missile re-entry vehicles?
Answer: Unanswerable

Question: What trait causes depleted uranium not to be used in gyroscopic compasses?
Answer: Unanswerable

Question: What type of beta emitter is uranium?
Answer: Unanswerable