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The dose-equivalent quantities which are recommended in radiation protection for environmental monitoring of penetrating radiation from external sources, are defined as the dose equivalents at specified points in the 30 cm diameter, tissue-equivalent ICRU sphere (ICRU, 1985). For area monitoring, the dose equivalent in 10 mm depth in the ICRU sphere, the ambient dose equivalent, H*(10), is suggested. In the case of neutron radiation, the appropriate calibration quantity is the neutron fluence . The neutron fluence-to-ambient dose-equivalent conversion factor is a complicated function of the neutron energy reflecting the energy dependence of the kerma factor, the quality factor and the radiation transport in the ICRU sphere. An ideal dose-equivalent meter for neutrons should be sufficiently sensitive and should have a reading such that the fluence response is identical to the conversion factor over the entire range of neutron energies encountered in practice, i.e. from thermal neutrons to at least 15 MeV, However, neutron monitors currently in use fail to meet these requirements.

Additional information

Authors: DIETZE G, Physikalisch-Technische Bundesanstalt, Braunschweig (DE)
Bibliographic Reference: EUR 11867 EN (1988)
Availability: (2)
ISBN: ISBN 92-825-9067-4;CD-NA-
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