Technetium-99m is a metastable nuclear isomer of technetium-99 (itself an isotope of technetium), symbolized as 99mTc, that is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope.
Technetium-99m is used as a radioactive tracer and can be detected in the body by medical equipment (gamma cameras). It is well suited to the role because it emits readily detectable 140 keV gamma rays (these 8.8 pm photons are about the same wavelength as emitted by conventional X-ray diagnostic equipment) and its half-life for gamma emission is 6.0058 hours (meaning 93.7% of it decays to 99Tc in 24 hours). The relatively "short" physical half-life of the isotope and its biological half-life of 1 day (in terms of human activity and metabolism) allows for scanning procedures which collect data rapidly but keep total patient radiation exposure low. The same characteristics make the isotope suitable only for diagnostic but never therapeutic use.
MTC may stand for:
Coordinates: 25°1′38.46″N 121°31′42.68″E / 25.0273500°N 121.5285222°E / 25.0273500; 121.5285222
Mandarin Training Center (Chinese: 國語教學中心) is one of the world's oldest and most distinguished programs for Chinese as a second language study. It is run by National Taiwan Normal University (NTNU) in Taipei, Taiwan and located at NTNU Da'an Campus.
The Mandarin Training Center (MTC) was founded in 1956. It was briefly known as the Center for Chinese Language and Culture Studies from 2002-2004. The center attracts students from all parts of the world to Taiwan to study Mandarin Chinese language and literature. Students also have access to courses in Chinese calligraphy, Chinese martial arts, and traditional music and theater. Courses are offered in three-month quarterly terms throughout the year. This system enables international students to engage in intensive language study during their summer breaks and within single semesters. The MTC sponsors travel, hosts speech contests, and stages workshops and performances.
(V: Greg)
Gotta gotta go now
Gotta keep a date
Be at the corner
Mistake to be late
Half block away now
Bus is at the light
Driver's grinning madly
It's a run for your life
MTC, MTC
You did it again, you did it to me
Getting on the bus now
Throw away your change
Don't forget your transfer
Driver's acting strange
Bus is really crowded
Can't find a seat
Going real fast
Gonna crash in the street
Picking up the pieces
In a fight that never ends
Getting away this time