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28 Si (the most abundant isotope, at 92.23%), 29 Si (4.67%), and 30 Si (3.1%) are stable. The longest-lived radioisotope is 32 Si, which is produced by cosmic ray spallation of argon . Its half-life has been determined to be approximately 150 years (with decay energy 0.21 MeV), and it decays by beta emission to 32 P (which has a 14.27-day half ...
"Emil Constantinescu a adus documente despre care spune că atestă colaborarea preşedintelui Traian Băsescu cu Securitatea" ("Emil Constantinescu brought documents of which he says that prove the collaboration of President Traian Băsescu with the Securitate")