  The dependencies of the B$_{i}$O$_{i}$ defect concentration on doping,
irradiation fluence and particle type in p-type silicon diodes have been
investigated. We evidenced that large data scattering occurs for fluences above
$10^{12}$ 1 MeV neutrons/cm$^2$, becoming significant larger for higher
fluences. We show that the B$_{i}$O$_{i}$ defect is metastable, with two
configurations A and B, of which only A is detected by Deep Level Transient
Spectroscopy and Thermally Stimulated Currents techniques. The defect's
electrical activity is influenced by the inherent variations in ambient and
procedural experimental conditions, resulting not only in a large scattering of
the results coming from the same type of measurement but making any correlation
between different types of experiments difficult. It is evidenced that the
variations in [B$_{i}$O$_{i}^\mathrm{A}$] are triggered by subjecting the
samples to an excess of carriers, by either heating or an inherent short
exposure to ambient light when manipulating the samples prior to experiments.
It causes $\approx$7h variations in both, the [B$_{i}$O$_{i}^\mathrm{A}$] and
in the effective space charge. The analyses of structural damage in a diode
irradiated with 10$^{19}$ 1 MeV neutrons/cm$^2$ revealed that the Si structure
remains crystalline and vacancies and interstitials organize in parallel tracks
normal to the Si-SiO$_{2}$ interface.
