This paper deals with a theoretical interpretation of the experiments on detection of radio frequency superradiation in a system of nuclear spins, conducted by the authors previously.1–3 The model Hamiltonian in the pseudospin representation is used for consideration. Dynamic equations are obtained for pseudospin and photon operators with allowance for oscillators of losses and thermal noise. The radiation generating process is shown to go on as follows: thermal noise initiates maser generation that results in a superradiation pulse. The importance of taking account of thermal noise is stressed by numerical estimations.

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The project in producing the hyperpolarized 3He and 19F are addressed in pursuit of radiation free medical diagnosis. The program for production of the hyperpolarized 3He by the brute force method with the Pomeranchuk cooling and the rapid melting of the solid 3He started a few years ago, and is still on the way, while a new program for production of the hyperpolarized 19F by means of the PHIP (ParaHydrogen Induced Polarization) has just got started. Particular attention is placed upon a new idea of the hyperpolarization catalyst to be used for 19F

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