Urban populations in Morocco receive free medical drugs as prescribed by doctors in district health centres.To explore the exposure pathway of ~(238)U and~(232)Th and their decay products on the skin of patients,these radionuclides were measured in various medical drugs by using solid-state nuclear track detectors(SSNTDs).The measured concentrations range of ~(238)U and ~(232)Th in the medical drug samples of interest vary from(4.3±0.3) to(11.1±0.7) mBq 1~(-1) and(0.49±0.03) to(1.3±0.1)mBq 1~(-1),respectively.A new dosimetric model,based on the concept of specific alpha-dose and alpha-particle residual energy,was developed for evaluating radiation doses to skin following the application of different medical drugs by patients.The maximum total equivalent effective dose to skin due to the ~(238)U and ~(232)Th series from cutaneous application of different medical drugs by patients was found to be 2.8 mSv year~(-1) cm~(-2). Urban populations in Morocco receive free medical drugs as prescribed by doctors in district health centers. To explore the exposure pathway of ~ (238) U and ~ (232) Th and their decay products on the skin of patients, these radionuclides were measured in various Medical drugs by using solid-state nuclear track detectors (SSNTDs). The measured concentrations of ~ (238) U and ~ (232) Th in the medical drug samples of interest vary from (4.3 ± 0.3) to (11.1 ± 0.7) mBq 1 -1 and (0.49 ± 0.03) to (1.3 ± 0.1) mBq 1 -1, respectively. A new dosimetric model, based on the concept of specific alpha-dose and alpha-particle residual energy, was developed for evaluating radiation doses to skin following the application of different medical drugs by patients. The maximum total equivalent effective dose to skin due to ~ (238) U and ~ (232) Th series from cutaneous application of different medical drugs by patients was found to be 2.8 mSv year ~ (-1) cm ~ (-2).