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Posted by / 24-Apr-2020 07:09

Radioactive dating gcse questions

The curve produced is called a radioactive decay curve.

We know that after one half life, one half of the original radioactive nuclei remain.

The age of the ancient organic materials can be found by measuring the amount of Carbon-14 that is left.

The most common tracer is called Technetium-99 and is very safe because it only emits gamma rays and doesn't cause much ionisation.

Animals and plants have a known proportion of Carbon-14 (a radioisotope of Carbon) in their tissues.

When they die they stop taking Carbon in, then the amount of Carbon-14 goes down at a known rate (Carbon-14 has a half-life of 5700 years).

i) Explain why the presence of radon gas in buildings is a health hazard.

To do this a small amount of Iodine-123 is injected into the patient, after 5 minutes 2 Geiger counters are placed over the kidneys.If smoke enters the alarm, this absorbs the a particles, the current reduces, and the alarm sounds. In paper mills, the thickness of the paper can be controlled by measuring how much beta radiation passes through the paper to a Geiger counter.The counter controls the pressure of the rollers to give the correct thickness.The count rate is measured by using an instrument called a Geiger-Muller tube over a period of time.A Geiger-Muller tube detects radiations by absorbing the radiation and converting it into an electrical pulse which triggers a counter and is displayed as a count rate. ] Radioactive elements have a wide range of half life values.

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The release of radiation is also a random event and overtime the activity of the radioactive material decreases.

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