What does APXS stand for?

Alpha Proton X-Ray Spectrometer

This definition appears very rarely and is found in the following Acronym Finder categories:

Science, medicine, engineering, etc.

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Samples in periodicals archive:

When it reaches Scooby Doo, the rover will make a 10-hour analysis of Scooby Doo using its alpha proton X-ray spectrometer.

ROVER NEARS SCOOBY DOO, A MARTIAN ROCK, FOR STUDY

Tests the previous day with the rover's alpha proton X-ray spectrometer showed high levels of silicon, an indication that the crust of Mars is much like Earth's, with lots of quartz created by recycling rocks through a series of volcanic eruptions.

JPL PUTS 360-DEGREE IMAGE FROM SOJOURNER ON INTERNET : DATA DELUGE ...

Before the communications break, NASA received data indicating the Sojourner rover had planted its chemical tester, an instrument called an alpha proton X-Ray spectrometer, on the rock dubbed Yogi for a 10-hour examination.

SOFTWARE BUG AGAIN CUTS OFF PATHFINDER SIGNAL