Parameter of neutron calibration field in Viet Nam following international standard

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Table 2

Combined standard uncertainties of technical parameters of neutron reference fields available in Vietnam.

Neutron reference field	Quantity	Combined standard uncertainty, k = 1 (%)
²⁴¹Am-Be	ϕ	2.1
	$\dot{H} * (10)$	4.5
	$\bar{E}$	3.0
	h*	5.0

²⁴¹Am-Be (15PE)	Φ	3.2
²⁴¹Am-Be (20PE)	$\dot{H} * (10)$	5.1
²⁴¹Am-Be (25PE)
²⁴¹Am-Be (30PE)	$\bar{E}$	4.5
²⁴¹Am-Be (35PE)	h*	6.0
²³⁹Pu-Be

Notation: Value of uncertainty budget, u_b (%):
B_b(E_b): 1.5% (stated in a certificate);
l: 1.0% (maximum estimated);
F_A(l): 1.0% (based on influenced factors in calculation dependent on different total cross section uncertainty);
F₁(90): 0.3% (maximum investigated);
h(E_b*): 4.0% (stated in (ICRU, 1998));
M_i: 1.0% (targeted in measurements);
R_ib(E_b): 3.0% (estimated).
For direct component of neutrons from a bare ²⁴¹Am-Be source (ISO-8529 criteria):
Uncertainty budgets taken into account for standard uncertainty of ϕ: ϕ_b(E_b), l, F_A(l), F₁(90) ;
Uncertainty budgets taken into account for standard uncertainty of $\dot{H} * (10)$ : ϕ_b, h^(E_b*);
Uncertainty budgets taken into account for standard uncertainty of $\bar{E}$ : ϕ_b
Uncertainty budgets taken into account for standard uncertainty of h^: ϕ; $\dot{H} (10)$
For total component of neutrons from other sources (ISO-12789 criteria):
Uncertainty budgets taken into account for standard uncertainty of ϕ: M_i, R_ib(E_b)
Uncertainty budgets taken into account for standard uncertainty of $\dot{H} * (10)$ : ϕ, h^(E_b*);
Uncertainty budgets taken into account for standard uncertainty of $\bar{E}$ :ϕ
Uncertainty budgets taken into account for standard uncertainty of h^: ϕ; $\dot{H} (10)$

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