1. The dosimeter (102, 300, 400, 500, 608, 610) for measuring the dose of the subject (100, 604) during a radiation therapy session under the control of magnetic resonance imaging, the dosimeter contains: the outer surface (106, 306, 308, 406, 408, 410, 412), configured to accommodate the surface (609, 611) of the subject, and separate cells (302, 402, 512), each of which is filled with a magnetic resonance radiation dosimeter. 2. The dosimeter according to claim 1, wherein the dosimeter further comprises a heat-insulating layer (106, 304, 404, 502) between the outer surface and the individual cells. The dosimeter according to claim 1 or 2, wherein the dosimeter is a vacuum pad (500, 610), the dosimeter additionally containing polystyrene beads (508, 510), each individual cell containing a shell (512) filled with a radiation resonance radiation dosimeter, and inside vacuum cushion separate cells and polystyrene foam balls mixed. 4. The dosimeter according to claim 2, wherein the dosimeter is a gasket (400), and individual cells (402) are dispersed evenly inside the heat-insulating layer (404) .5. The dosimeter according to claim 2, wherein the dosimeter is a blanket (300), with individual cells (302) located in a continuous layer, and a heat-insulating layer (304) surrounding the continuous layer. Dosimeter according to any one of paragraphs. 1, 2, 4, 5, while the dosimeter is configured to install a magnetic resonance imaging system on a patient support. 7. Dosimeter according to any one of paragraphs. 1, 2, 4, 5, while the dosimeter contains two parts (608, 610), and each of the two parts has an outer surface made with the possibility of placing two opposite surfaces of the subject. Dosimeter according to any one of paragraphs. 1, 2, 4, 5, while the dosimeter is magnetic1. Дозиметр (102, 300, 400, 500, 608, 610) для измерения дозы облучения субъекта (100, 604) во время сеанса лучевой терапии под контролем магнитно-резонансной визуализации, дозиметр содержит:наружн
