Introduction to screens (ref):

• standard
  • slow
  • calcium tungstate
• rare earth
  • fast
  • gadolinium or lanthanum
  • Commercial brands: Kodak Lanex

There's a good vendor summary / cross reference chart here: http://www.mcio.com/Products/comparison-chart.aspx

I think the number following the name is generally the gain. That is a 400 screen will put out twice as much light per x-ray as a 200 screen They call this the “speed” presumably because it makes film expose faster. Chart here

Brands:

• 3M
• AGFA
• DUPONT/STERLING
• FUJI
• JPI
• KIRAN
• KODAK
  • Lanex: rare earth green
• KONICA
• MCI OPTONIX

Following sections are for screens I own. Basically they were cheap on eBay

Image	Vendor	Product	Phosphor	Speed	Size	kV sensitivity	Notes
	Kodak	Lanex X-OMAT Fine	Green rare earth	100
	Kiran	KG4	Green rare earth	400
	Dupont	Cronex Quanta	Blue rare erath?		7“x17”

was offered a broken tube but I don't think it would have been useful