Resonant and nonresonant contributions to the photoactivation ofCd111

Abstract

A Co source has been used to photoactivate the 396 keV isomeric level (T&&2-48.6 min) of

Reply to ‘‘Comment on ‘Resonant and nonresonant contributions to the photoactivation of’111’’

“…could be consistent with their having neglected nonresonant contributions, but we do not believe this to be the explanation [2].…”

“…An experimental investigation of Monte Carlo predictions made in the Comment shows that the intensity of additional environmental Compton scattering is seriously overestimated. The Comment of von Neumann-Cosel et al [1] on our paper on the resonant and nonresonant contributions to the photoactivation of "'Cd [2] can be separated into two parts. In the first part they compare our results for the resonant cross sections for the photoactivation of isomeric levels in " In, " In, and Sr with cross sections obtained from other nuclear structure data and claim that the two sets of data can be correlated with the magnitude of the nonresonant cross sections.…”

“…For a bare, extended source of activity A ' the number of 1332 keV photons incident, per unit area and time, at a distance r will be a 2'/4mr, where a (l. . If we now place ys+h+ya +yt (2) where the respective terms are due to the eA'eets of the source and housing, the absorbers, and the target which is being activated.…”

“…This was not measured directly but the parameter k was a variable in a g analysis. We have used a variety of sources (in the same source housing); in three cases the sources had a diameter of 2 cm and a height of 1.8 cm [3,6,9], and in the other a diameter of 2 cm and a height of 0.7 cm [2]. The k values ranged from 0.12 up to 0.19 of the full-energy photon intensity, and in all cases the best k values obtained from the g analysis agreed with the source specifications of the source manufacturer.…”