Add UserReport script to admin pages?

Hi!
I want to add the UserReport feedback to the admin pages of my users, so they can give feedback and post ideas. I have to insert the code on the pages where I want to use it, but I want it on all the backend admin pages. Is it possible to do with this a MU-plugin, and how? I don't know how...
The code:

<script type="text/javascript">
var _urq = _urq || [];
_urq.push(['initSite', '92d17af9-119c-4fea-a6bf-d67bc0705d4b']);
(function() {
var ur = document.createElement('script'); ur.type = 'text/javascript'; ur.async = true;
ur.src = ('https:' == document.location.protocol ? 'https://cdn.userreport.com/userreport.js' : 'http://cdn.userreport.com/userreport.js');
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ur, s);
})();
</script>