| Zugriffsnummer | 13552 |
| Dokumenttyp | Konferenzartikel in Zeitschrift |
| Sprache | Englisch |
| Titel | A chamber for determining the conventionally true value of Hp (10) and H*(10) needed by calibration laboratories |
| Autor(in); Institution |
Ankerhold, Ulrike; 6.31, Orts- und Personendosimetrie, PTB-Braunschweig
Ambrosi, Peter; 6.31, Orts- und Personendosimetrie, PTB-Braunschweig
Eberle, Th.; Physikalisch-Technische Werkstätten Dr. Pychlau GmbH, Freiburg, GERMANY
|
| Quelle/Jahr | Individual monitoring of external radiation : proceedings of a European Workshop, Helsinki, Finland, September 4 - 6, 2000. Radiation Protection Dosimetry: 96 (2001), 1/3, 133 - 137 |
| Herausgeber(in) |
Bartlett, D. T.; National Radiological Protection Board, Didcot, UK
Böhm, Jürgen; 6, Ionisierende Strahlung, PTB-Braunschweig
|
| ISSN | 0144-8420 |
| ISBN | 1-870965-80-9 |
| Verlag | Ashford, Kent: Nuclear Technology Publishing |
| Konferenzangaben | European Workshop on Individual Monitoring of External Radiation, Helsinki, 04-06, September, 2000, Finland |
| Zusammenfassung | A secondary standard chamber for photon radiation developed for measuring directly the conventionally true value of the personal dose equivalent Hp(10), in a slab phantom is now commercially available. In addition, this chamber can be used for determining the true value of the ambient dose equivalent, H*(10), in monodirectional radiation fields, for example photon fields generated by X-ray facilities. Once the chamber was calibrated at the facility of the calibration laboratory, the true value of Hp(10) or H*(10) can be measured at other facilities without applying any conversion coefficients. For low-energy photon fields the conversion coefficients are strongly dependent on the spectral distribution. For nominally the same radiation quality small spectral differences, caused, for example, by use of different X-ray facilities, may lead to differences between the spectrum-average conversion coefficients from Ka to Hp(10) and H*(10), respectively, of up to several ten per cent. For this reason, tabulated conversion coefficients for low-energy radiation fields cannot be used for calibration purposes. Direct measurement by the secondary standard chamber overcomes this problem. |
