Proposed design for the PGAA facility at the TRIGA IPR-R1 research reactor

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Table 1 Variation of the experimental and calculated thermal neutron flux, in cm ^-2 s ^{- 1} ( ϕ_th ), and the factor f ( ϕ_th / ϕ_epi ) in the vertical channel of TRIGA reactor with the distance Z from the core

Z(cm)	110⁽³⁾	120⁽¹⁾	155⁽²⁾	200⁽³⁾	240⁽¹⁾	275⁽²⁾	290⁽³⁾	360⁽¹⁾	383⁽³⁾	395⁽²⁾	475⁽³⁾
Experimental
ϕ_th	4.7 x 10⁸	5.8 x 10⁷	2.2 x 10⁸	5.6 x 10⁷	2.8 x 10⁷	2.4 x 10⁷	1.8 x 10⁷	5.2 x 10⁷	5.9 x 10⁶	7.7 x 10⁶	5.6 x 10⁶
f	99	112	140	58	80	---	63	73	41	---	59
Calculated (MCNP)
ϕ_th	5.1 x 10⁸	----	1.6 x 10⁸	4.3 x 10⁷	----	2.0 x 10⁷	1.5 x 10⁷	----	7.2 x 10⁶	6.3 x 10⁶	4.9 x 10⁶
Δ_cod.(%)	1	----	3	4	----	6	6	----	8	8	10
Δ_exp(%)	9	----	27	23	----	17	17	-----	22	18	13
f	41	----	----	28	----	----	22	----	21	----	28
Δ_rel(%)	59	----	----	51	----	----	65	----	48	----	53