| (19) |
 |
|
(11) |
EP 1 059 657 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
07.01.2004 Bulletin 2004/02 |
| (43) |
Date of publication A2: |
|
13.12.2000 Bulletin 2000/50 |
| (22) |
Date of filing: 01.06.2000 |
|
|
| (84) |
Designated Contracting States: |
|
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
|
Designated Extension States: |
|
AL LT LV MK RO SI |
| (30) |
Priority: |
07.06.1999 GB 9913198
|
| (71) |
Applicant: EUROPEAN COMMUNITY |
|
1049 Brussels (BE) |
|
| (72) |
Inventors: |
|
- Spirlet, Jean Claude
B-Geel (BE)
- Wellum, Roger
B-Geel (BE)
- De Bièvre, Paul
B-Kasterlee (BE)
|
| (74) |
Representative: Freylinger, Ernest T. et al |
|
Office Ernest T. Freylinger 234, route d'Arlon B.P. 48
8001 Strassen
8001 Strassen (LU) |
|
| |
|
| (54) |
Isotopic reference material |
(57) This application relates to a reference material for the calibration of a mass spectrometer
for isotopic analysis, the reference material including
- a filament comprising one or more metals (X) selected from W, Re, Rh, Ir, Pd and Pt
and alloys thereof having melting points greater than approximately 1800°C and vapour
pressures lower than approximately 10-6 Torr at 2000°C,
- the filament having a coating on at least a portion thereof of an intermetallic compound
comprising one or more metals (Y) selected from W, Re, Rh, Ir, Pd and Pt and alloys
thereof having melting points greater than approximately 1800°C and vapour pressures
lower than 10-6 Torr at approximately 2000°C and one or more metals (Z) selected from
the lanthanides and the actinides.