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	Labels	Notes
	Kodak	Lanex X-OMAT Fine	Green rare earth	100			EXTREMITY Tube Side Kodak cassette Kodak Lanex Fine Screens KODAK X-OMAT Cassette Made in the U.S.A. by EASTMAN KODAK COMPANY Rochester, New York 14650 TM: Kodak, Lanex, X-Omat KP 115179 KODAK LANEX FINE 1261004232CA#9341
	Kiran	KG4	Green rare earth	400			SKU: JV-NIC-B-KIRACASE Date: 1/30/12 BIN: Kiran 8“x12” KG4 Medical Hospical X-Ray Hard Case Intensifying Screen Cassette Kiran Intensifying Screens Date Installed: 12/05 Screen Type: KG4 Date Last Cleaned: KG4 825234
	Dupont	Cronex Quanta Detail	Blue rare erath	100	7“x17”		EXTREMITY CASSETTE 18×43 cm. (7 x 17 in.) LETTER NO. 8 SCREEN NO. DATE CLEANED: 7-20-98 BY: FM 11382 DUPONT CRONEX INTENSIFYING SCREENS QUANTA DETAIL DUPONT QUANTA DETAIL-T J1 3CCC24

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