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https://mars.nasa.gov/msl/mission/instruments/spectrometers/apxs/
https://mars.nasa.gov/mer/mission/spacecraft_instru_apxs.html
http://onlinelibrary.wiley.com/doi/10.1029/2003JE002150/full

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The APXS uses alpha decay along with the radioisotope of curium known as: (²⁴⁴Cm).

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Used on Mars exploration rovers, like the curiosity rover. It is also used in some dust removal tools.

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The Alpha Particle X-ray Spectrometer... Where is it?

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The Alpha Particle X-ray Spectrometer... Where is it?

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One can be found on the turret end of the Curiosity rover, the device staring at you from the picture.

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The APXS exposes the surface to alpha particles and X-rays during the radioactive decay of an element called "Curium".

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Earlier models of the APXS took up to 3 times longer to process readings.

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The APXS itself is about the size of a cupcake, which means it can only read a small surface area each procedure.

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The APXS is mounted on the turret end of the arm used for it, so it is easy to move it around and get tight readings.

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The curiosity rover is the most advanced rover used for science up to date, and the APXS is a very important part of it's discoveries and general mission.

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The Alpha Particle X-ray Spectrometer... What is it?

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The Alpha Particle X-ray Spectrometer... What is it?

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The Alpha Particle X-ray Spectrometer (APXS) is a small type of camera used to analyze the chemical elements found in martian soil or rock.