The HADEDE project is initiated to improve the radiation measurement technology using know-how already available but not yet combined in Estonia and Latvia. The goal of the project is to establish a cooperation between two SMEs to design and manufacture a next-generation hand-held spectrometer. The project will combine the benefits of computer modeling and simulation expertise available in Tartu, Estonia with the strengths of custom manufacturing and long term experience in detector technologies in Riga, Latvia. The target is to achieve improved cooling solution for the spectrometer based on the Stirling principle. To achieve this it is crucial to reduce heat losses in the vacuum chamber of cryostat with the germanium detector. This will allow the use of a low-power Stirling cooler, a major power consumer in the device. This also reduces the size and weight of the hand-held spectrometer and makes its application more comfortable.