4 ms·
Muon Tomography is kind of like interpolating the interior structure of things using shadows, right? Cosmic ray muons have been used for decades to radiograph
by adolph 4y ago
Muon Tomography is kind of like interpolating the interior structure of things using shadows, right?
Cosmic ray muons have been used for decades to radiograph objects such as pyramids and geological structures. The technique of muon transmission imaging was first used in the 1950s by Eric George to measure the depth of the overburden of a tunnel in Australia. In a famous experiment in the 1960s, Luis Alvarez used muon transmission imaging to search for hidden chambers in the Pyramid of Chephren in Giza, although none were found at the time; a later effort discovered a previously unknown void in the Great Pyramid.
https://en.wikipedia.org/wiki/Muon_tomography https://en.wikipedia.org/wiki/Muon_tomography
- defrost 4y agoWith a few additional twists .. rather than "simple" direct photon paths originating from an effective point source with some diffraction into Umbra, penumbra and antumbra you have a diffuse source (the entire visible sky) with varying strength from angle | amount of atmosphere and a spectrum of energies from primary high energy rays and scattered impact products of lesser energy. But, in essence, similar principle; a fixed position detector within a pyramid records the HE spectrum across a period of time and moved (or several detectors operate in unison) and the spectra are used used to reconstruct probable variations in density .. In airbourne radiometry the HE counts are recorded and calibration flights (lines at multiple altitudes) are performed to estimate the cosmic spectra coming in from above .. in order to subtract that from observed spectra to reach an esimate of spectra from the ground ( from U, K, Th .. radon, etc ).