The invention relates to a solution containing a nitroxide radical for nuclear magnetic resonance magnetometry. This solution consists of a nitroxide radical of formula: ## STR3 ## in which R ** 1, R ** 2, R ** 3 and R ** 4 which may be identical or different, represent an alkyl group or an optionally deuterated alkoxy group, or in which the pairs R ** 1-R ** 2 and / or R ** 3-R ** 4 together form an optionally deuterated cycloalkyl or polycycloalkyl group, and N represents ** 14N or ** 15N, dissolved in a solvent having an oxidizing power and a suitable viscosity. BR/ The solvent may consist of a mixture of water and two compounds acting respectively as agent oxidizer and viscosity modifier, for example, water, ethylene glycol and NalO4, or be constituted solely by a mixture of water and an oxidizing agent capable of modifying the viscosity such as the acid acetic acid. / P
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