Radioisotopes
Definition of an isotope: An isotope is an Atom with the same number of protons, but differing numbers of neutrons. Isotopes are different forms of a single element. Smoke Detectors
I) Americium-241 emits alpha particles.
II)The alpha particles emitted by the Am-241 collide with the oxygen and nitrogen in air in the detector's ionisation chamber to produce charged particles (ions).
When smoke enters the chamber, the smoke particles attach to the charged ions, neutralizing them and stopping the alpha particles.
This causes the number of ions present – and therefore the electric current – to fall, which sets off an alarm.
III) This type of smoke detector is more common because it is inexpensive and better at detecting the smaller amounts of smoke produced by flaming fires.
Tracers
I) Gamma ray.
II) Radioactive isotope, usually injected into the patients’ bloodstream for the purpose of imaging some part of the body. The radiographer puts a detector around the body to detect any gamma rays or beta particles that pass out of the patient's body.
Nuclear radiation can damage cells. To avoid possible harm to the patient, it is important that medical tracers do not stay active in the body for long periods.
III) The radioisotopes used have short half-lives so that they are quickly eliminated from the body, the radiation doses in such procedures are very low and the risks have been carefully examined.
Reality TV! Even the word beings every negative image thought imaginable come racing to my mind. Normally I wouldn’t get so worked up about something as insignificant as TV shows, but reality TV has proven to be the exception. I don’t just hate reality TV I loathe it. Reality TV is just dumb, despicable and disgusting.
I think it’s odd that these shows are called “reality television” when they are so far detached from reality. This brings me to my next point how is becoming the next pop idol or living in a jungle reality? It may be
I) Americium-241 emits alpha particles.
II)The alpha particles emitted by the Am-241 collide with the oxygen and nitrogen in air in the detector's ionisation chamber to produce charged particles (ions).
When smoke enters the chamber, the smoke particles attach to the charged ions, neutralizing them and stopping the alpha particles.
This causes the number of ions present – and therefore the electric current – to fall, which sets off an alarm.
III) This type of smoke detector is more common because it is inexpensive and better at detecting the smaller amounts of smoke produced by flaming fires.
Tracers
I) Gamma ray.
II) Radioactive isotope, usually injected into the patients’ bloodstream for the purpose of imaging some part of the body. The radiographer puts a detector around the body to detect any gamma rays or beta particles that pass out of the patient's body.
Nuclear radiation can damage cells. To avoid possible harm to the patient, it is important that medical tracers do not stay active in the body for long periods.
III) The radioisotopes used have short half-lives so that they are quickly eliminated from the body, the radiation doses in such procedures are very low and the risks have been carefully examined.
Reality TV! Even the word beings every negative image thought imaginable come racing to my mind. Normally I wouldn’t get so worked up about something as insignificant as TV shows, but reality TV has proven to be the exception. I don’t just hate reality TV I loathe it. Reality TV is just dumb, despicable and disgusting.
I think it’s odd that these shows are called “reality television” when they are so far detached from reality. This brings me to my next point how is becoming the next pop idol or living in a jungle reality? It may be