In physics, attenuation (in some contexts also called extinction) is the gradual loss in intensity of any kind of flux through a medium. For instance, sunlight is attenuated by dark glasses, X-rays are attenuated by lead, and light and sound are attenuated by water.n engineering, attenuation is usually measured in units of decibels per unit length of medium (dB/cm, dB/km, etc.) and is represented by the attenuation coefficient of the medium in question.
PET Scan (Skull to Mid-Thigh) Cost and Procedure Information. Positron Emission Tomography, also called a PET scan, is a diagnostic examination that involves the acquisition of physiologic images based on the detection of radiation from the emission of positrons. Positrons are tiny particles emitted from a radioactive substance administered to the patient.
A woolly mammoth carcass recently unearthed in Siberia could be the best hope yet for scientists aiming to clone the massive, long-extinct beast. The mammoth specimen, which was discovered in 2013 in a remote part of Siberia, oozed a deep red liquid when it was first discovered.Scientists have now analyzed the mammoth to understand how it lived and died â and whether it will yield enough undamaged DNA to make cloning the extinct creature a reality.he mammoth specimen, which was discovered in 2013 in a remote part of Siberia, oozed a deep red liquid when it was first discovered. Scientists have now analyzed the mammoth to understand how it lived and died â and whether it will yield enough undamaged DNA to make cloning the extinct creature a reality.