ANS Standard on Neutron and Photon Fluence-to-Dose Conversion Coefficients Initiated (ANS-6.1.1)

摘要

A Project Initiation Notification System (PINS) form has recently been approved and submitted to the American National Standards Institute (ANSI) by the American Nuclear Society (ANS) to register proposed new standards project ANS-6.1.1, "Neutron and Photon Fluence-to-Dose Conversion Coefficients." The proposed new standard will supersede historical standard ANS-6.1.1-1991 (W2001), "Neutron and Gamma-Ray Fluence-to-Dose Factors," and will be reissued with a new title. Because the 1991 version was administratively withdrawn by ANSI for lack of maintenance, it is no longer recognized by ANSI as a current standard and will be considered a new standard when approved. The new standard will present data recommended for computing the biologically relevant dosimetric quantity in photon and neutron radiation fields. Specifically, this standard is intended for use by radiation shielding designers for the calculation of effective dose. Fit coefficients are given for evaluating whole-body effective dose per unit fluence for photons with energy between 10 keV and 10 GeV and for neutrons with energy between 0.001 eV and 10 GeV. The purpose of this standard is to assist those involved in the design or analysis of radiation facilities by providing a means for determining whether calculated fluence levels satisfy radiation exposure limits recommended by the International Commission on Radiological Protection (ICRP) or specified by regulatory agencies. The standard is relevant for those applications whose intent is to reduce to an acceptable level the occurrence of stochastic somatic effects resulting from the radiation exposure. Use of this standard in assessing the likelihood of nonstochastic effects, such as applications in which the effective dose is far in excess of occupational exposure guidelines, is not recommended. This standard is also not intended for use in testing or calibrating instruments.