An additional task is to organise the participation in in situ intercomparison exercises in real situations, defining the most suitable equipment to carry these out. This paper presents the activities of the WP5 and a summary of the main results obtained in these activities after the first two years of work. | INSIDER WP5 in situ measurements developed activities main results and conclusions EPJ Nuclear Sci. Technol. 6 12 2020 Nuclear Sciences M. Herranz et al. published by EDP Sciences 2020 amp Technologies https epjn 2019061 Available online at https REGULAR ARTICLE INSIDER WP5 in situ measurements developed activities main results and conclusions Margarita Herranz1 Raquel Idoeta1 Khalil Amgarou2 Frédéric Aspe3 Csilla Csöme4 Sven Boden5 and Marielle Crozet6 1 Nuclear Engineering and Fluid Mechanics dpt. University of the Basque Country UPV EHU Pza. Ingeniero Torres Quevedo 1 48013 Bilbao Spain 2 Commissariat à l énergie atomique et aux énergies alternatives CEA Direction de l énergie nucléaire DEN DDCC CCMA GA2P Marcoule BP 17171 30207 Bagnols sur Cèze Cedex France 3 Mesures Nucléaires ONET Technologies 970 chemin des agriculteurs 26701 Pierrelatte France 4 Nuclear Security Department Centre for Energy Research EK Konkoly-Thege M. 29-33 1021 Budapest Hungary 5 Dismantling Decontamination and Waste Expert Group Belgian Nuclear Research Centre SCK CEN Boeretang 200 2400 Mol Belgium 6 Commissariat à l énergie atomique et aux énergies alternatives CEA Direction de l énergie nucléaire DEN DMRC Univ. Montpellier Marcoule BP 17171 30207 Bagnols sur Cèze Cedex France Received 14 September 2019 Received in final form 19 November 2019 Accepted 10 December 2019 Abstract. Within the INSIDER project the WP5 in situ measurements has been tasked with analysing the existing systems and methodologies for carrying out these types of measurements in constrained environments aiming to classify and categorise these environments. An additional task is to organise the participation in in situ intercomparison exercises in real situations defining the most suitable equipment to carry these out. This paper presents the activities of the WP5 and a summary of the main results obtained in these activities after the first two years of work. 1 Introduction situ .