Table 2

An estimated range of unc. for specific unc. sources is listed for absolute, absolute clean ratio and absolute indirect ratio data. The unc. for shape data of the same kind are analogous except for δN which is 0%.

Unc. source Absolute Absolute clean ratio Absolute indirect ratio
Sample mass >1% Both samples Both samples
Counting statistics Sample & measurement time-dependent Both, combined Both samples
Attenuation 0.2%–2% 0.02%–0.2% 0.2%–2%
Detector efficiency 1%–2% 0–0.3% 1%–2%, 0.5%–1%
FF angular distribution ≈ 0.1% Less than absolute ≈0.1%
Background 0.2–>10% 0.2–>10% 0.2–>10%
Energy unc. 1%, 1–3 ns Combined Both detectors
Neutron flux >1% Cancels or small Cancels or small
Multiple scattering 0.2%–1% Less than absolute 0.2%–1%
Impurities in the sample Sample-dependent Both samples Both samples
Dead time >0.1% Both combined Both detectors

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