Question: What town on the Castletown River was the home of a famous radiologist who lived from 1900-1979

<P0-S0> Dundalk ( , Irish: "Dún Dealgan" , meaning "Dalgan's fort" ) is the county town of County Louth, Ireland. <P0-S1>  It is on the Castletown River, which flows into Dundalk Bay, and is near the border with Northern Ireland, halfway between Dublin and Belfast. <P0-S2>  It has associations with the mythical warrior hero Cú Chulainn. <SEP> <P1-S0> Castletown is a small village of Sunderland in Tyne and Wear commonly visited by tourists from around the world. <P1-S1>  A former mining community, the Hylton Colliery was located at the east end of the village, it lies north of the River Wear, and is near to Hylton Castle and Washington. <P1-S2>  At Hylton Riverside, on the eastern fringe of Castletown, there is a large retail park hosting stores such as Matalan, Costa Coffee, Aldi and Pets at Home, Premier Inn and a DW Sports Fitness gym. <P1-S3>  There are currently on going talks and plans to transform this retail park into a more modern and high-end park hosting a range of designer stores such as Farfetch, Apple and Waitrose to project the vision of this luxurious community. <P1-S4>  There is also plans to build a large 13-screen Odeon Cinema. <P1-S5>  Along with the range of retail establishments there is also a wide range of restaurants in the village such as McDonald's, KFC and Solo Pizza (formerly known as Mario's Pizza). <SEP> <P2-S0> Sir Peter Kerley CVO (1900–1979) was a radiologist from Dundalk, Ireland. <SEP> <P3-S0> Sleeman is an unincorporated community located in Rainy River District in Northwestern Ontario, Canada. <P3-S1>  The town site is located in the center of Dawson. <P3-S2>  The original town site was along the Rainy River some 3 km south but in the early 1900s when the steam ships that traveled from Fort Frances to Rainy River and then to Rat Portage Via Lake of the Woods carrying Logs, Lumber, mail and other supplies stopped probably because the Canadian Northern Railway had finished its bridge and rail line from Winnipeg to International Falls and the docks of the great lakes located in Fort William and Port Arthur now known as Thunder Bay the town moved from the river to the rail line. <P3-S3>  The original store, coffee shop, post office building still stands today and has been renovated into a home. <P3-S4>  The town for many years held many stores, a large hotel, coffee shops, car dealership, school and a busy rail depot that served the Northern communities along Highway 621. <P3-S5>  A restaurant called The Green Onion was the local favourite, it was open 7 days a week and held indoor livery stables below for the travels from Morson who came to town to meet the trains, liquor was served here as well. <P3-S6>  Today there is only one business left, the Canada Postal outlet. <P3-S7>  Lowes Lumber a local business for over 80 years went into bankruptcy and closed its doors in 2014. <P3-S8>  Only about 20 homes remain, even though an official town plan was made to accommodate many more. <P3-S9>  The rail siding was removed in 1993, the last of the CN hotel burned away in the late 1980s and the grocery store was demolished when the natural gas line was installed to serve the larger communities along Highway 11.