Zongren Shi, Xiantang Zeng, Ming Zhang. A facility for producing high purity thermal neutron beam and its design[J]. Nuclear techniques, 1989, 12(3): 143-148.
Zongren Shi, Xiantang Zeng, Ming Zhang. A facility for producing high purity thermal neutron beam and its design[J]. Nuclear techniques, 1989, 12(3): 143-148.DOI:
Tne facility has been set up on the 10 MW heavy water reactor in the Institute of Atomic Energy. A 50 cm long single crystal silicon cooled by liquid nitrogen is used for improving the quality of thermal column. At 77K
the neutron flux is 1.3×10
7
Cd-ratio is 30000 and
γ
-dose in the beam is 1.935×10
-8
C/kg·s.
The calculation of the neutron collimetor is given in detail. Neutron flux for a conical collimator is 1-4 times more than that for a straight collimator with the same angle converging. The relations of flux and angular divergence with the shape of collimator are described.
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