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Additional resources for Integral Neutron Thermalization [annual summ rpt Oct 61 - Sep 62]

Example text

Consequently, the m o s t r e c e n t and m o s t p r e c i s e m e a s u r e m e n t s on w a t e r poisoned w i t h boric acid have all been m a d e with a concentration of 43. 7 g p e r l i t e r of solution. @ A typical e x p e r i m e n t a l setup f o r m e a s u r e m e n t of s p e c t r a in a finite, one-dimensional m e d i u m is shown in Fig. 14. In the thin dimension, flux plots a r e taken to d e t e r m i n e the flux shape. A 1-in. - d i a m e t e r r e - e n t r a n t tube with a thin (0.

F o r each s p e c t r u m m e a s u r e m e n t , a background i s subtracted. F o r background r u n s , a 1-in. cube of B i O C i s placed on the end of the r e - e n t r a n t tube f o r the a n g u l a r - s p e c t r a m e a s u r e m e n t s and i s placed on the s o u r c e side of the tank covering the end of the g l o r y hole for the s c a l a r - s p e c t r a m e a s u r e m e n t s . The p r e c o l l i m a t o r opening on the 37 38 e n t r a n c e to the flight path is s i z e d to view only the end of the r e - e n t r a n t tube o r the end of the z i r c o n i u m s c a t t e r e r , Neutrons f r o m the wall of the r e - e n t r a n t tube o r the g l o r y hole will m a r k e d l y d i s t u r b the s p e c t r u m being m e a s u r e d and m u s t be excluded.

4 e v ) foils, b a r e indium ( t h e r m a l ) foils, and c a d m i u m - c o v e r e d gold ( w 5 e v ) f o i l s . As c a n be s e e n , the build-up on the s o u r c e side of the tank v a r i e s f o r e a c h neutron e n e r g y even though the solution i s heavily poisoned. Thus, on this s i d e of the tank we a r e definitely contending with t r a n s i e n t flux conditions. It should b e noted that the flux f o r e a c h neutron e n e r g y peaks a t about the s a m e location in the s l a b and then f a l l s off with about the s a m e slope to the opposite boundary.

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