Thread by @mmahesh1

Real story re today's Physics Tip
MP: Walking w measuring devices

FL: Hey doc, what is “Air-KARMA”? I have heard ‘Good Karma’ or ‘Bad Karma’, & am sure U have lot of ‘Good Karma’, then why the new term ‘air-karma’?

MP (smiling): Dude, it's not “Air-Karma”, it's “Air- KERMA"

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MP (smiling): It is “Air- KERMA (Kinetic Energy Released per Unit Mass)”. If u asked any of my residents, they would have told u.

Anyway, air-Kerma is measure of x-ray beam intensity measured using ion-chamber which aides to estimate patient risk.
@aapmstsc @aapmHQ

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MP: In fact, I am here to measure the ‘air-kerma’ for your system.

FL: Thanks! then why “air-Kerma” is always expressed in “milli-Gray”?

MP: Generally, SI unit of air-Kerma is “Gray” named after a famous physicist Louis Harold Gray

@RSNA @ACRRFS

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MP: Generally, SI unit of air-Kerma is “Gray” named after a famous physicist Louis Harold Gray. Since Gray is a large unit, for most medical imaging doses, we generally express in “milli-Gray” (mGy)

FL: Thanks Doc, go ahead w your measurement & let me know if I all is ok

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