The calculated distance (air line) between Skarżysko-Kamienna and Radom is approximately 23 miles respectively 37 kilometers.
By car or train, the actual journey to Radom is certainly longer, as only the direct route (as the crow flies) between Skarżysko-Kamienna and Radom has been calculated here.
Air line (approximately)
37 kilometers
20 nautical miles