Please select the most similar patent number from A, B, C and D. Which number is?
The present invention provides an irradiation target for producing a Mo-99 isotope in a heavy water reactor, comprising: a plurality of fuel elements, each comprising a cladding, a uranium-containing core, and an end plug. An end part of the cladding is provided with a filling opening. The end plug covers the filling opening at the end part of the cladding, and is in sealing connection with the cladding. The uranium-containing core is filled in a sealed cavity formed by the end plug and the cladding. A plurality of fuel elements are provided. End plates are arranged at both ends of the fuel elements and are fixedly connected to the plurality of fuel elements. The uranium-containing core of at least one of the fuel elements is an uranium-containing core provided with a rich uranium fuel, and the  235  U enrichment degree of enriched uranium fuel is 6.0 wt% - 20.0 wt%. By means of the present invention, existing reactors may be utilized for non-stop production of Mo-99 having a short half-life. By using enriched uranium to produce Mo-99, the efficiency is high and the quality is good. Meanwhile, effects on power generation of a nuclear power plant can be reduced to a maximum extent.
A: Disclosed is a piezoelectric thermoelectric dynamic isotope cell, comprising: a gas pipeline (109); a heat source cavity covering case (106), two opposite ends of the heat source cavity covering case (106) respectively being in communication with the two ends of the gas pipeline (109), such that a closed circulation pipeline is formed, and a unidirectional gas charging valve (108) being arranged on the heat source cavity covering case (106); a fuel box (102), the fuel box (102) being fixedly provided inside the heat source cavity covering case (106); a radioactive source (101), the radioactive source (101) being arranged in the fuel box (102); a gaseous working medium (110), the gaseous working medium (110) being filled in the circulation pipeline; a piezoelectric energy conversion assembly (201), the piezoelectric energy conversion assembly (201) being provided on an inner surface of the gas pipeline (109); a thermoelectric energy conversion assembly (206), the thermoelectric energy conversion assembly (206) being provided on an outer surface of the gas pipeline (109) and spaced apart from the piezoelectric energy conversion assembly (201); and a single-cavity compressor (207b), the single-cavity compressor (207b) being provided on the gas pipeline (109) and being used for driving the gaseous working medium (110) to flow in a circulating manner.
B: A nuclear power plant spent fuel negative pressure unloading system, comprising a fuel element transport pipe and a gas transport pipe (1). The fuel element transport pipe comprises a fuel element output pipe, a fuel element lifting pipe, and a fuel element unloading pipe connected in series. The fuel element unloading pipe is arranged obliquely downward in the direction of movement of a fuel element. The distal extremities of the fuel element unloading pipe are connected sequentially to fuel loading apparatus (26 and 39) and a transfer apparatus. The gas transport pipe (1) is connected at either extremity thereof respectively to set positions on the fuel element output pipe and the fuel element unloading pipe. A gas driving mechanism is connected onto the gas transport pipe (1). An inlet of the gas driving mechanism is arranged at an extremity in proximity to the fuel element unloading pipe. The sealed system prevents significant oxidation of a spent fuel element due to high temperature, thus ensuring the integrity of the fuel element in the transfer apparatus and the safeness of the system.
C: A target used for heavy water reactor production of C-14 isotopes, which comprises: a target tube, which has a target material (11) and/or an absorber material (14), the target material (11) being a nitrogen-containing solid material; end plates (2), which are arranged at two ends of the target tube; a connection rod (3), which is provided with a connection component that is connected to a positioning mechanism used for positioning the target, wherein the connection rod (3) passes through the target tube along the axial direction of the target tube, and the target tube is fixedly connected to the connection rod (3) by means of the end plates (2). The present invention can be adapted to be placed at different locations such as at a guide tube, an inspection passage, or a fuel channel to undergo irradiation and produce C-14 isotopes.
D: Disclosed is an environmentally friendly easy-to-recover sharps container, comprising a container body (1) and a container cover (2). The container body (1) is provided with a protruding cylinder portion (11) integrally formed with the container body (1), the protruding cylinder portion (11) is internally provided with a fuel groove (110) for placing fuel, a feeding pipe (111) in communication with the fuel groove (110) is arranged on the protruding cylinder portion (11), the protruding cylinder portion (11) is provided, inside the fuel groove (110), with a first segmentation ring (1101) and a second segmentation ring (1102) that are integrally formed with the protruding cylinder portion (11), a plastic bent pipe (112) in communication with the fuel groove (110) is further arranged on the protruding cylinder portion (11), the end of the plastic bent pipe (112) away from the protruding cylinder portion (11) extends into the container body (1) through the container body (1) and is in communication with an annular plastic pipe (113), several fuel outlets (1130) are further provided in the annular plastic pipe (113), and a valve (1120) is further arranged on the plastic bent pipe. Before a worker performs incineration, the valve on the plastic bent pipe can be opened, and the fuel in the fuel groove can flow out and into the container body. In this way, the inside and outside of the sharps container can synchronously burn when the whole sharps container is incinerated, and this can increase the incineration speed, thereby making burning more thorough.
Answer: C