We present 13 Broad Absorption Line ( BAL ) quasars , including 12 new objects , which were identified in the Sloan Digital Sky Survey ( SDSS ) and matched within 2 ^ { \prime \prime } to sources in the FIRST radio survey catalog .
The surface density of this sample of radio-detected BAL quasars is 4.5 \pm 1.2 per 100 ~ { } deg ^ { 2 } , i.e .
approximately 4 times larger than previously found by the shallower FIRST Bright Quasar Survey ( FBQS ) .
A majority of these radio-detected BAL quasars are moderately radio-loud objects .
The fraction of BAL quasars in the entire radio quasar sample , 4.8 \pm 1.3 \% , is comparable to the fraction of BAL quasars among the SDSS optical quasar sample ( ignoring selection effects ) .
We estimate that the true fraction of BAL quasars ( mostly HiBALs ) in the radio sample is 9.2 \pm 2.6 \% once selection effects are accounted for .
We caution that the absorption troughs of 4 of the 13 radio-detected quasars considered do not strictly satisfy the standard BALnicity criterion .
One or possibly two of the new radio-detected BAL quasars are of the rare “ iron LoBAL ” type .
BAL quasars are generally redder than the median SDSS quasar at the same redshift .