Connect SCR to arduino

Hey Guys,

I love my Arduino, I got it for my birthday and started playing with it. My first project is highspeed Photography kit. Right now i have everything working so that when a loud noise will turn on a LED on pin 13. I was wondering how you connect a SCR. I have a MCR72-06 ( How would i go about connecting it. Would it have anything to do with that pin 13 also drives the LED on the Arduino board?

Any help is greatly appreciated.