Exempel på americium

• Two new drugs have been approved to treat radiation contamination due to plutonium, americium, or curium.

• Officials insist that the low levels of plutonium, americium and other man-made radioactive contaminants present in the groundwater pose no public health threat.

• To determine the a-value, two discs were irradiated with an -241 americium source.

• In the case of plutonium, the material changes its characteristics over time, mainly as a result of the formation of americium 241.

• Is it true, for example, that one was americium?

• Practically all the plutonium 241 and americium 241 remains indefinitely immobilised below the surface layer of seabed sediments.

• It is estimated that about one third of this had decayed to give some 5,560 curies of americium 241 by the end of 1982, the rest remaining as plutonium 241.

• The americium-241 and curium-242 isotopes also were produced by irradiating plutonium in a nuclear reactor.

• Am can be used for generating heavier americium isotopes by further neutron capture inside a nuclear reactor.

• The alpha particles emitted by the decay of the americium collide with the light beryllium nuclei, producing fast neutrons.

• Americium is a relatively soft radioactive metal with silvery appearance.

• Americium is commonly used in industry as both an alpha particle and low photon energy gamma radiation source.

• Uranium and thorium also have diverse current or historical uses, and americium is used in the ionization chambers of most modern smoke detectors.

• They checked for different radioactive substances including gamma emitters, plutonium, americium and strontium.

• Its toxicity is comparable to, but slightly lower than that of americium and plutonium.

• This was the fifth transuranium element discovered after neptunium, plutonium, curium and americium.

• A small source of radioactive americium is placed so that it maintains a current between two plates that effectively form an ionisation chamber.