Radioactive nuclide iodine-125 nucleus purity rapid determination apparatus and method

Abstract

The present invention relates to a nuclear purity quick determination apparatus and method for a radionuclide nuclide iodine-125. The apparatus comprises a sample room, an energy discrimination shielded flask, a multi-channel energy spectrometer and a special lead shielded apparatus. The present invention also comprises an energy discrimination shielded room using high density materials such as lead or iron. The thickness of a lead shielded layer ranges from 0.5mm to 1.0mm. The thickness of an iron shielded layer is 10mm. The multi-channel energy spectrometer adopts a sodium iodide NaI Gamma spectrometer with low energy resolution. The determination method of the present invention comprises steps as follows: (1), the iodine-125 is fully shielded by the energy discrimination shielded flask; (2), nuclide identification and characteristic photon are conducted to iodine-126; (3) the measured result is analyzed using SPAN / Win NaI sodium iodide Gamma ray spectra, so the percentage composition of iodine-126 is measured. The present invention results in that the iodine-125 seed source manufacturing enterprise can use the energy spectrometer with low cost and maintenance requirement and the ray energy discrimination technology to measure the percentage composition of the impurity nuclide with low content quickly and accurately. The present invention is of low investment and convenient routine maintenance.

Description

technical field [0001] The invention belongs to the technical field of nuclear purity detection, and in particular relates to a rapid determination device and method for radionuclide iodine-125 nuclear purity. Background technique [0002] Reactor Thermal Neutron Beam Irradiation of Natural Isotope Xenon-124[ 124 Xe] generates radionuclide iodine-125[ 125 I], it emits low-energy photons (average energy 28Kev), with a half-life of about 60 days, belonging to a short half-life radionuclide. All kinds of chemical preparations formulated according to these characteristics are widely used in various fields, and have been widely used in the diagnosis and treatment of diseases in the field of nuclear medicine. In the early 1980s, foreign applications started from 125 The sealed seed source made of I treats cancer, and partly replaces conventional cobalt-60 ( 60 Co) external radiotherapy, its advantages are: when the former is treated, the seed source is directly implanted into t...

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Problems solved by technology

However, if the impurity nuclide content is lower than one ten-thousandth, due to the limitation of the counting resolution time of the energy spectrometer, the measured sample activity generally does not exceed tens of microcui, otherwise the counting loss will be large and the data will be inaccurate. The activity of the impurity nuclide contained in the main nuclide is very small, and it needs to be measured by a highly stable energy spectrometer for a long time to accumulate enough counts for analysis. Inspection is unrealistic; at the same time, high-resolution semiconductor energy spectrometers are usually used for energy spectrum measurement, which is expensive, requires high daily maintenance, and is difficult for enterprises with little capital and weak technical force to accept

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