A neutron dosimeter, comprising: a cylindrical body made of a polyethylene material acting as moderator; an active component acting as neutron detector, the active component being located in the center of the cylindrical body ; and neutron filters configured to compensate an over sensitivity of the neutron detector in a given energy region, the neutron filters being formed by at least two crowns , which are made of a material with a given thickness, and top and bottom caps , the at least two crowns being placed inside the cylindrical body , a first of said two crowns being placed adjacent to the active component and a second of said two crowns being placed between the first crown and an inner wall surface of the cylindrical body , the top and bottom caps being configured to cover open ends of the first crown , the top cap having an opening to allow introduction of the active component therein; characterized in that : a thickness of a material of the top and bottom caps is the same as the thickness of the material of the two crowns ; the first and second crowns each comprises a plurality of vertical ribbons, an area covered by the plurality of vertical ribbons in each crown, excluding the top and bottom caps , being comprised in a range between 50 - 95%; and in that the dosimeter further comprises: a removable element placed between the first crown and the active component adapted to improve performance of the neutron detector to intense neutron radiation fields, in pulsed or continuous form, said removable element including a hollow cylinder with inner diameter between 1.05 and 1.2 times an outer diameter of the active component . a cylindrical body made of a polyethylene material acting as moderator; an active component acting as neutron detector, the active component being located in the center of the cylindrical body ; and neutron filters configured to compensate an over sensitivity of the neutron detector in a given energy region, the neutron filters being formed by at least two crowns , which are made of a material with a given thickness, and top and bottom caps , the at least two crowns being placed inside the cylindrical body , a first of said two crowns being placed adjacent to the active component and a second of said two crowns being placed between the first crown and an inner wall surface of the cylindrical body , the top and bottom caps being configured to cover open ends of the first crown , the top cap having an opening to allow introduction of the active component therein; a thickness of a material of the top and bottom caps is the same as the thickness of the material of the two crowns ; the first and second crowns each comprises a plurality of vertical ribbons, an area covered by the plurality of vertical ribbons in each crown, excluding the top and bottom caps , being comprised in a range between 50 - 95%; and in that the dosimeter further comprises: a removable element placed between the first crown and the active component adapted to improve performance of the neutron detector to intense neutron radiation fields, in pulsed or continuous form, said removable element including a hollow cylinder with inner diameter between 1.05 and 1.2 times an outer diameter of the active component . <EOS>