Intercomparison of Neutron-Source Emission Rates (1979-1984)

Abstract

This is a report of an international comparison of determinations of neutron-source emission rates. Contributions received from fourteen laboratories describing emission-rate measurements of three sources by four different methods are analysed by a least-squares minimization procedure to determine the best values for the three emission rates and for the residual differences in the measured values. The residual differences are considerably reduced when the input values are normalized to a common set of standard cross-sections and to a common basis for the calculation of corrections.

Clinical brachytherapy with neutron emitting sources and adherence to AAPM TG‐43 dosimetry protocol

“…34 The 252 Cf source to be assayed is located in a small Teflon™ cavity at the center of a 1.2-m-diam spherical bath. The purpose of the cavity is to reduce thermal neutron absorption of the source.…”

Methods of Neutron Source Strength Measurements

“…No national metrological laboratory employed this method in the key-comparison CCRI(III)-K.9.Am-Be (1999 -2005) and only two laboratories, PTB and VNIIM, used it in the comparison CCRI(III)-K.9. Cf-252 (1978Cf-252 ( -1984 [5].…”

International Quality Control of Neutron Calibration Measurements

“…Key comparisons of primary national standards, established for neutron metrology, are organised by section III of the consultative committee for ionising radiation , CCRI(III). Up to 20 NMI's or their associated laboratories participated in 8 key comparisons which were completed and published from 1970 to 1991 [3][4][5][6][7][8][9][10][11]. MRA requires repetition of such…”