Can i add nuclear radiation sources or microwave emitter sources to gazebo ?

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Yes, you could, and I imagine it might be similar to the Wireless sensors currently in gazebo:

• https://bitbucket.org/osrf/gazebo/src...
• https://bitbucket.org/osrf/gazebo/src...
• https://bitbucket.org/osrf/gazebo/src...

These sensor models were added in the following pull requests:

• https://bitbucket.org/osrf/gazebo/pul...
• https://bitbucket.org/osrf/gazebo/pul...

Yes! If you've got a sensor that you think others would find useful, then we'd like to see it. You'll want to check out the contributing guidelines for gazebo. It's a very long doc, but reading it will save you tons of time in the pull request process overall. Once you think you're ready, make a pull request, and people will look over it, try it out, and give some feedback.