Das Prim�rspektrum der schnellen Neutronen einer (Ra?+Be)-Quelle und deren unelastische St��e in Pb. II

Abstract

Das Spek~rum der yon einer (Ra ~r + Be)-Quelle ausgesandten schnellen Neutronen wird hinter 7 cm Pb dutch Beobachtung der yon ihnen in einer photographischen Schicht ausgel6sten RiiekstoBprotonen untersucht. Durch Vergleich mit dem PrimSxspektrum werden Riickschliisse auf die unelastische Streuung in Pb gezogen. * "q'or, getragen auf der Tagung der Deutschen Physikalischen Gesetlschait in der Britischen Zone in Hamburg am 22. April 1949.

Measurement of neutron flux and spectra for physical and biological applications

“…A comparison of fast neutron spectrometers is given in table 12. The problem of obtaining spectra from the data yielded by spectrometers having nonlinear response may be handled by using a matrix-inversion technique (Hubbell and Scofield, 1958).…”

“…oL-^_LJ_J______P*. Curve A was measured with a hydrogen-recoil proportional counter (Schmidt-Rohr, 1953); curve B with nuclear emulsions (Houtermans and Teucher, 1951); curve C with a counter¬ absorber arrangement called the "Ranger" (Hill, 1947); curve D with nuclear emulsions (Demers, 1945); and curve E with nuclear emulsions (Watson, 1958). Neutron energy spectrum of Ac-Be (a, n).…”

Physical aspects of irradiation: recommendations of the International Commission on Radiological Units and Measurements (ICRU) report 10B 1962

“…The fuller in¬ formation conveyed by a distribution curve, however approximate, is much more valuable than a single mean value. For a fuller discussion of LET distribution, see the original papers (Burch, 1957;Cormack, 1956;Cormack et al, 1957;Howard-Flanders, 1958, andSchneider andCormack, 1959).…”

“…For further information the reader is referred to NCRP (1960). Curve A was measured with nuclear emulsions (Medveczky, 1961); Curve B with nuclear emulsions (Houtermans and Teucher, 1951); Curve C with a counter-absorber arrangement called the "Ranger" (Hill, 1947); Curve D with nuclear emulsions (Demers, 1945); and Curve E with nuclear emulsions (Watson, 1958). Nuclear emulsions were used for the measurement (Medveczky, 1961).…”

“…Burch (1957) has derived a method of progressively calculating for a com¬ plete initial energy spectrum the energy dissipated by small collisions in each of a number of electron energy intervals. A graphical summary of various electron-dissipation distributions as a function of linear energy transfer has been presented by Howard-Flanders (1958). Rossi et al, (1961) have critically discussed the specification energy deposition in a small volume with particular at¬ tention to the statistical fluctuations and to the combined effect of more than one traversing par¬ ticle.…”