Сообщается о разработке метода одновременного селективного детектирования изотопологов молекулярного йода 127I2, 127I129I и 129I2 в газовых средах, характерных для предприятий ядерного топливного цикла и атмосферы. Предлагаемый метод относится к методам лазерно-флуоресцентной спектроскопии и заключается в анализе спектров флуоресценции смеси изотопологов молекулярного йода. Метод предусматривает регистрацию интенсивностей флуоресценции на предварительно рассчитанных длинах волн. В качестве источника возбуждения флуоресценции предлагаются лазеры на парах меди, излучающие на длинах волн 510.6 и 578.2 нм. Метод позволяет осуществлять высокочувствительный мониторинг изотопологов молекулярного йода (в том числе радиоактивного 129I2) в реальном масштабе времени в технологических средах, образующихся в процессах переработки отработавшего ядерного топлива, в газовых выбросах радиохимических предприятий и в атмосферном воздухе.

This paper reports the experimental and calculation research of the development of the remote laser-induced fluorescence method for the detection of I-129 and I-127 molecular iodine isotopologues in atmospheric air in real time. As an excitation source we used a frequency-doubled neodymium laser (similar to 532 nm). We estimated the sensitivity of (II)-I-127-I-129 and I-129(2) detection in the atmosphere. Detection sensitivity of molecular iodine is 4 . 10(13) cm(-3) for a sensing distance of 6 km.

The paper deals with the study of I-127(2), (II)-I-127-I-129 and I-129(2) fluorescence excited by radiation of a copper vapor laser at 510.6 nm. Iodine molecule absorption lines, resonant at the wavelength of laser radiation, were identified. The obtained results were compared to those obtained while exciting fluorescence with lasers radiating at wavelengths 578.2 and 532 nm. It was shown that copper vapor lasers with a wavelength of 510.6 are promising for performing high-sensitive real-time detection of molecular iodine-129 in gaseous media. The obtained results may be used for developing totally new cost-effective and environmentally friendly technologies of electricity generation, based on fast reactors, which is extremely important for providing humanity with environmentally friendly generated electric energy.

This letter deals with the development of a new laser method for simultaneously detecting I-127(2), (II)-I-127-I-129 and I-129(2) in gaseous media, which, in contrast with existing methods, does not require tuning of the laser wavelength. The method is based on exciting fluorescence in iodine isotopologues using copper-vapor laser radiation (578.2 nm) and registering the separate spectral fluorescence line intensities. This method allows high-sensitivity real-time monitoring of isotopologues of molecular iodine-129 and iodine-127 in technological media generated during the reprocessing of spent nuclear fuel, in gaseous emissions from the purification systems of radiochemical plants and in the natural atmosphere.

This work reports on research into the fluorescence of (II)-I-127-I-129 and I-127(2) isotopologues excited by radiation from a frequency-doubled neodymium laser. We determined the wavelengths of excitation radiation that are optimal for the simultaneous detection of the mentioned isotopes being mixed with each other in atmospheric air. A laser-induced fluorescence (LIF) method is proposed to measure the concentrations of (II)-I-127-I-129 and I-127(2) simultaneously. The paper shows that the minimum measurable fraction of (II)-I-127-I-129 molecules mixed with I-127(2) is 6.5 x 10(-7), which is more than ten times better than existing results obtained by LIF for monitoring iodine in the atmosphere.

This paper reports on the results of research into the fluorescence of molecular iodine-127 and iodine-129 isotopologues, excited by copper vapor lasers at a wavelength of 578.2 nm. It is shown that these lasers are a promising source for developing a high-sensitivity selective laser-fluorescence method for iodine isotopologue detection in gaseous media, in particular in the atmosphere.