Abstract:
:A secondary standard ionisation chamber for photon radiation for measuring an ionisation current, which is directly proportional to the conventionally true value of the ambient dose equivalent, H*(10), was optimised. The chamber was developed in the Austrian Research Centers Seibersdorf and is used successfully worldwide by dosimetry laboratories. The chamber response with respect to H*(10) for photon energies from 40 to 1,250 keV is nearly constant. For lower photon energies the response is strongly energy-dependent and does not fulfil the requirements concerning the quality of a secondary standard given in ISO 4,037-2, i.e. for energies for which the determination of the conventionally true value of H*(10) is very difficult. Considering the dose limits defined in the Directive 96/29/Euratom, in the case of whole-body irradiation the knowledge of the personal dose equivalent is of importance down to energies of approximately 12 keV. For area dosimetry, this means that the knowledge of H*(10) for energies approximately >or=12 keV is necessary. To get one secondary standard chamber for H*(10) for the whole photon energy range and to close the gap for low energies in the dissemination of the conventionally true value of H*(10), the chamber was optimised for a flat response for energies from approximately 12 to 1,250 keV.
journal_name
Radiat Prot Dosimetryjournal_title
Radiation protection dosimetryauthors
Ankerhold Udoi
10.1093/rpd/nci334keywords:
subject
Has Abstractpub_date
2006-01-01 00:00:00pages
16-21issue
1eissn
0144-8420issn
1742-3406pii
nci334journal_volume
118pub_type
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