Publikationen > Reihen > PTB-Berichte > Verzeichnis der PTB-Berichte > PTB-Berichte Dosimetrie (Dos)
PTB-Berichte Dosimetrie (Dos)
Publikations Einzelansicht
PTB-Dos-35 |
Comparison of the PTB and OMH Air Kerma Standards for Medium Energy x-rays |
|---|---|
| Autor(en): | , , und |
| Report Typ: | PTB-Bericht |
| Jahr: | 2000 |
| Seite(n): | 15 S. |
| ISBN: | ISBN 3-89701-592-7 |
| Zusammenfassung: | A comparison between the primary air kerma standards for medium-energy X-rays of the PTB and the OMH was made using a transfer ionisation chamber calibrated against both standards. The ratios of the calibration factors measured at PTB and OMH were between 1,0006 and 1,0015 for the BIPM medium energy X-ray series and between 0,9923 and 0,9983 for the ISO narrow-spectrum series. All ratios are well within the expanded uncertainties (k=2) and so the comparison results are satisfactory. However, the ratios of the calibration factors for the ISO narrow-spectrum series measured at the PTB and the OMH deviate systematically from those of the BIPM medium-energy X-ray qualities by about 0,5 % on the average. Possible causes could be beam non-uniformities which contribute to a different amount to the response of the primary standard and the transfer chamber in the measurements at both laboratories. The main properties of the X-ray beams and of the free-air standards at both laboratories are described. |
| Bemerkung: | Comparison of the PTB and OMH Air Kerma Standards for Medium Energy x-rays ; (PTB-Bericht PTB-Dos-35) |
© Physikalisch-Technische Bundesanstalt, letzte Änderung: 2012-06-05, WEB-Redaktion
Druckansicht, 
PDF