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It is a radioisotope of phosphorus that, under its various forms (Phosphorus-32P, Sodium Phosphate 32P and Chromic Phosphate 32P), is used intravenously in the treatment of polycythemia vera, chronic myeloid leukemia, chronic lymphocytic leukemia, bone metastases, malignant effusions and ovarian or prostate carcinoma. It is also used in the diagnosis of tumors. Intra-articular injection has been used in rheumatoid arthritis and other arthropathies. (Martindale)
It is excreted in breast milk. The potential radiation dose for the infant that was measured two days after the maternal administration was less than 180 microSv (18 mrem), therefore less than 1 milliSv. (Mountford 1994) and in another study it was 50 - 60 mrad daily. (Carlson 1983)
If we want to limit exposure to 0 mili Servers (mSv), you should stop breast-feeding for a period equivalent to from 5 to 10 biological half-lives. It is also possible to determine the radioactivity in milk samples.
Since the annual natural background radiation we receive is around 6 mSv (1 mGy, 100 mrad) (ARSAC 2020), for a more conservative approach we should wait just long enough to achieve an infant exposure of less than 1 mSv (0.1 rem, 0,1 rem, 0,17 mGy, 17 mrad).
Given its long elimination half-life, -11 days for Sodium Phosphate P32 and 14 days for Phosphorus P32- (Mountford 1994), an interruption of breastfeeding of 55 to 70 days would be necessary to avoid irradiating the infant, with milk being expressed and discarded in the meantime, thereby which makes it impossible to continue breastfeeding.