[en] Neutron and gamma-ray leakage measurements were taken at various stages of shield construction of neutron flight path 5 (the Lash-up flight path) at LANSCE, to compare the relative effectiveness of several configurations. Dose equivalent rates were determined for three categories: ''low-energy neutrons'', below 20 MeV; ''high- energy neutrons'', above 20 MeV; and gamma rays, as measured by hand-held survey instruments. The low energy neutrons were measured by activation of an indium foil in a paraffin-filled cadmium canister, sized to be generally insensitive above 20 MeV. High-energy neutrons were measured by (n,2n) production of Carbon 11 in a plastic scintillator with a 20-MeV threshold. Thermal neutrons were not measured at the shield-leakage test points. Room-scattered neutrons were observed by Albatross IV detector readings, which were taken beside the shield as a measure of variation of room background as the shield configuration changed. 1 fig., 1 tab

[en] A tissue-equivalent ionization chamber with associated circuitry has been developed for area radiation monitoring in the Intense Pulsed-Neutron Source (IPNS) facility at Argonne National Laboratory. The conventional chamber configuration was modified in order to increase the electric field and effective volume thereby achieving higher sensitivity and linearity. The instrument provides local and remote radiation level indications and a high level alarm. Twenty-four of these instruments were fabricated for use at various locations in the experimental area of the IPNS-1 facility

[en] Neutron spectral measurements were made in LANSCE Experimental Room 1 during an intentional spill of 100 nA on a carbon block in the beam channel. The relative response of two neutron dosimetry badges and a neutron survey meter were investigated. The resultant neutron spectrum had a strong high-energy component containing 25% of the flux density and 70% of the neutron dose equivalent. The dosimetry badges and the survey meter underresponded by 80, 20 and 50%, respectively. Due to their individual energy responses, a simple sum of the two dosimeter results gives a total dose equivalent, which is close enough to the unfolded spectrum value to be used for personnel dosimetry records. 2 figs., 2 tabs

[en] Neutron spectral measurements were made in LANSCE Experimental Room 1 during an intentional spill of 100 nA on a carbon block in the beam channel. The relative response of two neutron dosimetry badges and a neutron survey meter were investigated. The resultant neutron spectrum had a strong high-energy component containing 25% of the flux density and 70% of the neutron dose equivalent. The dosimetry badges and the survey meter underresponded by 80, 20 and 50%, respectively. Due to their individual energy responses, a simple sum of the two dosimeter results gives a total dose equivalent, which is close enough to the unfolded spectrum value to be used for personnel dosimetry records. (author)

[en] Neutron and gamma-ray leakage measurements were taken at various stages of shield construction for neutron flight path 5 (the Lash-up flight path) at LANSCE, to compare the relative effectiveness of several configurations. Dose equivalent rates were determined for three categories: ''low-energy neutrons'', below 20 MeV; ''high-energy neutrons'', above 20 MeV; and gamma rays, as measured by hand-held survey instruments. The low-energy neutrons were measured by activation of an indium foil in a paraffin-filled cadmium cannister, sized to be generally insensitive above 20 MeV. High-energy neutrons were measured by (n,2n) production of Carbon 11 in a plastic scintillator with a 20-MeV threshold. Thermal neutrons were not measured at the shield-leakage test points. Room-scattered neutrons were observed by Albatross IV detector readings, which were taken beside the shield as a measure of variation of room background as the shield configuration changed. (author)

[en] Neutron and gamma-ray leakage measurements were taken at various stages of shield construction for neutron flight path 5 (the Lash-up flight path) at LANSCE, to compare the relative effectiveness of several configurations. Dose equivalent rates were determined for three categories: low-energy neutrons, below 20 MeV; high-energy neutrons, above 20 MeV; and gamma rays, as measured by hand-held survey instruments. The low-energy neutrons were measured by activation of an indium foil in a paraffin-filled cadmium cannister, sized to be generally insensitive above 20 MeV. High-energy neutrons were measured by (n,2n) production of Carbon 11 in a plastic scintillator with a 20-MeV threshold. Thermal neutrons were not measured at the shield-leakage test points. Room-scattered neutrons were observed by Albatross IV detector readings, which were taken beside the shield as a measure of variation of room background as the shield configuration changed. 1 fig., 1 tab