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Hoger Onderwijs Reactor (HOR)

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Contact details

Blaauw, Menno Dr.
Applied Sciences (TNW), Radiation, Radionuclides & Reactors
Mekelweg 15, 2629 JB Delft
Tel : +31 (0)15 27 83528
E-mail : M.Blaauw@TUDelft.nl
Website : Open website

General Information


Hoger Onderwijs Reactor (HOR)


Reactor hall, Reactor Institute Delft, Mekelweg 15, Delft (building #50)

Key words:

neutron scattering, beam, radiation, nuclear, uranium, research reactor

Main application:

The reactor provides neutron radiation to a variety of facilities for radioisotope production and neutron activation analysis. It is equipped with six horizontal beam-tubes in two sets of three at opposite sides of the core mainly used for neutron scattering experiments. The two larger beam tubes are equipped with stacked-mirror neutron guides (neutron guide system) to obtain clean beams of thermal neutrons with low contamination by fast neutrons and gamma rays. One neutron guide system provides two beams for experiments in the reactor hall. The other neutron guide system provides 4 neutron beams to the experiment hall, adjacent to the reactor hall. Measuring 25 x 40 m, this hall provides ample space with low radiation background for beam experiments. Finally, one of the beam-tubes is used by the source of variable-energy positrons (POSH).

Instrument specification

The HOR is an open pool-type research reactor, using MTR-fuel assemblies and low-enriche Uranium-235 (< 20%) as fuel. The core is composed of 20 fuel assemblies including 4 control assemblies. It is equipped at three sides with a row of Be-reflector assemblies acting as neutron reflectors.