The National Institute of Standards and Technology (NIST) is seeking information from sources capable of providing four Am-241 alpha reference sources with specific technical specifications, including anodized aluminum construction and defined dimensions. This is a sources sought notice for market research purposes only, not a solicitation for proposals. Responses must be submitted via email to the primary point of contact as soon as possible, preferably before the closing date and time. No budget information is specified in the notice. The location for performance of services is not mentioned.