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phosphor screens |
represented by
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The phosphor screens used by the BVS and BIS
systems are available separately.
They consist of a glass disc or fiberoptic plate coated with P-20
phosphor and are aluminized.
An extra layer of aluminum is deposited in a ring 0.050" (1.27mm)
wide on the outer diameter of the phosphor screens.
This allows for electrical contact to the phosphor screen using
optionally available metal contact rings.
Screens are aluminized to increase light efficiency by up to
100% since light created at the phosphor is reflected back at
the aluminum layer.
Also, the conductive aluminum layer aids in the reduction of
charge build up from electrons and ions.
If the phosphor screen is used in conjunction with an electron multiplier such as a microchannel plate (MCP), an electron acceleration energy of 3kV will be required to pierce the aluminum layer. |
| If this acceleration voltage is too high for a particular application, indium-tin-oxide (ITO) coated screens can be used to provide the conductive base needed to minimize the electrostatic effects of charged particles. Phosphor screens can also be ordered with P-11, P43, P46, and P-47 phosphors. If a custom size is required, or you need your own disc re-coated, please contact Colutron Research for a quotation. | |
| part # |
base
material |
phosphor type | phosphor thickness |
dimensions
f
( mm diameter ) |
effective areaf
( mm diameter ) |
thick-
ness ( mm ) |
taper ratio | ||
|
input surface |
output surface |
input surface |
output surface |
||||||
| 805-1 | glass disc |
P20
aluminized |
P20:10~15µm Al:250~500Å | 24. 76 | 24. 76 | 22. 22 | 22. 22 | 1. 55 | 1 : 1 |
| 805-2 | glass disc | P20 aluminized | P20:10~15µm Al:250~500Å | 50. 17 | 50. 17 | 47. 63 | 47. 63 | 1. 55 | 1 : 1 |
| 705-1 | fiberoptic | P20 aluminized | P20:10~15µm Al:250~500Å | 22. 23 | 22. 23 | 19. 69 | 19. 69 | 6. 36 | 1 : 1 |
| 705-2 | fiberoptic | P20 aluminized | P20:10~15µm Al:250~500Å | 28. 14 | 13. 7 | 25. 60 | 12. 80 | 28. 0 | 2 : 1 |
| 705-3 | fiberoptic | P20 aluminized | P20:10~15µm Al:250~500Å | 41. 0 | 13. 7 | 38. 46 | 12. 82 | 41. 0 | 3 : 1 |
| 705-4 | fiberoptic | P20 aluminized | P20:10~15µm Al:250~500Å | 54. 8 | 13. 7 | 52. 26 | 13. 07 | 60. 0 | 4 : 1 |
|
phosphor type |
chemical composition |
typical peak wavelength |
fluorescent color |
decay time |
typical quantum yield ( photons / electron-volt ) |
typical absolute efficiency (radiated W / W excitation) |
| P11 | ZnS:Ag | 460 nm | Blue | 34µs | 0.038 | 0.10 |
| Good energy conversion (efficiency) for blue light | ||||||
| P20 | ZnCdS:Ag | 560nm | Yellow-green | 60µs | 0.063 | 0.14 |
| Good energy conversion (efficiency) for green light, Good for UV radiation, 250nm to 300nm | ||||||
| P43 | Gd2O2S:Tb | 545nm | Green | 1ms | - - - | - - - |
| Excellent scintillator for x-rays < 250nm. | ||||||
| P46 | Y3Al5O12:Ce | 530nm | Yellow-green | 300ns | - - - | - - - |
| P47 | Y2SiO5:Ce | 400nm | Blue | 55ns | - - - | - - - |
| Fast Decay | ||||||
|
Local representative in Japan
|
| Colutron Research Corporation | APACE Science |
|
2321 Yarmouth Avenue,
Boulder, Colorado 80301 U.S.A. |
Mitomo-Bldg.#2 - 6F, Ebisu-nishi 2-Chome,
2 - 8, Shibuya-Ku, Tokyo 150-0021 Japan |
||||
|
phone#
Fax# |
+1 (303) 443-5211
+1 (303) 449-5050 |
phone#
Fax# |
+81 (0)3 - 3463 - 3204
+81 (0)3 - 3463 - 3205 |
||
| contact: | Erik Wahlin, Ph.D. | ||||
| e-mail: | erik@colutron.com | ||||
| web: | http://www.colutron.com/ | ( Last updated: ) | |||
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