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A technology of activated carbon box and activated carbon layer, which is applied in the field of activated carbon box for high-efficiency radon measurement, to achieve the effects of improving accuracy, convenient use, and shortening the monitoring cycle
Active Publication Date: 2013-06-26
NAVY MEDICINE RES INST OF PLA
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[0004] The structure and size of activated carbon cartridges can be designed and manufactured by different units according to the conditions of the measuring equipment, but the activated carbon cartridges used at home and abroad are all cylindrical designs (such as Produced by China Institute of Metrology, Beijing Nuclear Instrument Factory, etc.), when the sampling is arranged, the adsorption surface of the carbon faces upward, so the activated carbon on the top layer adsorbs more radon and its progeny in the air, and when the probe is used for measurement , which measures the bottom with less adsorption, resulting in lower measurement efficiency
In addition, there is no in-depth study on the thickness of activated carbon in the carbon bed to maximize the measurement efficiency.
While the cylindrical geometry of the activated carbon cartridge results in low measurement counts, it also greatly reduces its measurement efficiency and stability
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Embodiment 1
[0022] Embodiment 1. A kind of activated carbon box for measuring radon efficiently
[0023] Such as Figure 1-3 As shown, an activated carbon box for high-efficiency radon measurement is cylindrical and consists of four parts: a groove-shaped top cover 1, a groove-shaped hollow mesh 2, a bottomless outer wall cylinder 3, and a bottom cover 4 from top to bottom. The bottomless outer wall cylinder 3 is fixed with the groove-shaped hollow net 2 to form a whole, forming an inner cavity and a concave interlayer cavity with a longitudinal section, the interlayer cavity is filled with activated carbon layer; the groove The inner wall and the bottom wall of the shaped hollow net 2 are covered with sieve holes, and the sieve holes are connected with the interlayer cavity, and the size of the gaps in the ventilation structure is smaller than the particle size of the activated carbon. The sieve holes are convenient for the adsorption of radon progeny when the carbon box is placed, so a...
[0027] Equipment used: 2007 standard NaI detector (CANBERRA company), Inspector multi-channel gamma spectrometer (CANBERRA company), N-G275 lead chamber (Pailou Instrument Factory, Changsha County, Hunan Province)
[0028] (1) Experiment on the distribution law of the probe efficiency of the multi-channel gamma spectrometer:
[0029] The point source and the foam board are used to measure the source at different heights (5-25 mm) from the surface of the NaI probe, and a fixed measurement position (front and side) is set on the NaI probe.
[0030] In the experiment, 133Ba and 137Cs point sources were used to measure at different heights (0mm, 7mm, 14mm and 21mm), with 1, 2, 3, and 4 points on the front of the NaI probe, and 5, 6, 7, 8, 9, and 10 points on the side. The standard source measure interval is 12mm.
[0031] Table 1. Longitudinal comparison of Ba sources at different heights ...
Embodiment 3
[0058] Embodiment 3. Measuring radon experiment
[0059] The original carbon box (manufactured by China Institute of Metrology), and the new carbon box are derived from Example 1 (the thickness of the front and side carbon layers of the activated carbon layer are 25mm and 15mm respectively)
[0060] Equipment used: 2007 standard NaI detector (CANBERRA company), Inspector multi-channel gamma spectrometer (CANBERRA company), N-G275 lead chamber (Pailou Instrument Factory, Changsha County, Hunan Province)
[0061] Experimental procedure is described with embodiment 2, and result is as follows
[0062]
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Abstract
The invention belongs to the technical field of environment detection and particularly relates to a high-efficiency radon-measuring activated carbon box and a radon-measuring method thereof. The high-efficiency radon-measuring activated carbon box disclosed by the invention is characterized by comprising a top cover, a groove-shaped container and a bottom cover, wherein the groove-shaped container comprises an outer container wall and a recessed structure, the top ends of the outer container wall and the recessed structure are formed into a whole, the groove-shaped container is provided with an inner cavity and a sandwiched cavity of which the longitudinal section is shaped like a letter U, and the sandwiched cavity is filled with an activated carbon layer; and the side wall and bottom wall of the recessed structure are provided with a ventilating structure communicated with the sandwiched cavity, and the sizes of gaps of the ventilating structure are smaller than the sizes of activated carbon particles. The activated carbon box provided by the invention has simple structure, is convenient to use, shortens the monitoring period by 30-40%, increases the accuracy by 200-300%, and improves the applicability of the existing activated carbon box method.
Description
technical field [0001] The invention belongs to the technical field of environmental detection, and in particular relates to an active carbon box for highly efficient radon detection. Background technique [0002] Radon is a highly harmful natural radioactive gas. Radon and its series of progeny are radioactive and emit alpha particles. Long-term inhalation of radon can harm the bronchi and lungs, leading to lung cancer and other diseases. There are many reports of radon-induced lung cancer at home and abroad, and more than half of the natural background radiation dose received by people all over the world comes from radon. Therefore, the International Commission on Radiation Protection (ICRP) pays special attention to the protection of radon, and has published many publications, which provide an important basis for countries to formulate protection standards for radon. [0003] For the monitoring of radon, almost the same technology is adopted at home and abroad. There ...
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