Dose mean lineal energy for neutrons
The definition of the quality factor for charged particles may be based on lineal energy density rather than on LET. In recent work the neutron quality factor is derived in terms of the mean value of y(D). Without knowledge of the f(y) distribution, this has been calculated using the proximity function approach for protons, alpha particles and heavy recoils, from thermal energy up to 14.1 Mev in soft tissue. This work relates to the f(y) distribution in a sphere of 1 micron diameter. Smaller target sizes have, however, been proven to be relevant in quantitative radiation biology. The variation of y(D) with target size (1 nanometer up to 1 micron) is shown as a function of neutron energy. The deviation from the LET-approximation is discussed; this is caused by straggling effects and delta-ray escape and is most pronounced at small target sizes. Results of the several new concepts are compared with each other and with previous results based on q(L), and the impact on neutron radiation protection is discussed.
Bibliographic Reference: Paper presented: 10th Symposium on Microdosimetry, Roma (IT), May 21-26, 1989
Availability: Available from (1) as Paper EN 34946 ORA
Record Number: 198911143 / Last updated on: 1994-12-01
Original language: en
Available languages: en