[填空题]
A 1.0-mCi source of dgg8 nl+grdg-9- 31wbo: kgzxa5rb v(j7ks( wzrl;8y:t; gex l1m ild8qyo*2$_{15}^{32}\text{P}$ (in $\text{NaHPO}_4$), a $\beta^-$ emitter, is implanted in a tumor where it is to administer 36 Gy. The half-life of $_{15}^{32}\text{P}$ is 14.3 days, and 1 mCi delivers about $10\ \text{mGy/min}$. Approximately how long should the source remain implanted? day
