Description

The biological shielding has two tasks:

• The in the neutron source generated neutron radiation is guided to the sample in a suitable manner for the selected experiment. Therefore are beam tubes integrated to define beam direction and cross section. The build-in monochromator defines the wavelength for the experiment.
• The neutron radiation coming out from the reactor core as well as the from reactions of these neutrons with matter generated secondary radiation (x-ray, γ) is dangerous. The material mix selected for the shielding absorbs both types of radiation. Therefore the amount of radiation in the experimental area is reduced to a minimum to protect people and environment. This fact yields also an improved signal-to-background ratio for better quantitative data analysis.

Hardware

• Fourteen steel containers, filled with different heavy concrete (3.5, 4.5, 6.0 to/m³) for maximum protection from radiation, dimensions over all about 2.35 x 2.20 x 3.30 m³ (w*h*d),
• coating of the primary beam tube SR-9B and the monochromator tube with boronized PE and additional coating of the monochromator tube with lead for improved radiation protection,
• because of limited room the shielding is assembled directly at its end position using the main crane in the experimental hall (max. capacity 10 to),
• the monochromatized radiation is guided through one of the three secondary beam tubes (2θ_M=20°, 40°, 50°) to the experiment,
• integrated beam tube SR-9A to allow a second experiment at the hot source.