37 results about "Radon Daughters" patented technology

The invention discloses a method for rapidly measuring radon concentration by zero-order approximation, comprising measurement and calculation. At first, a radon measurement instrument is enabled to work under a scale mode, radon concentration is reversely deduced by using the counting of a long-time 218Po peak in a standardized radon chamber to obtain a scale factor, which is therefore equivalent to an RAD7 radon measurement instrument working under a sniff mode; the radon measurement instrument is then switched to work under a zero-order approximation mode, measurement cycle and cycle times are set, and after the radon measurement instrument is started up, the air outside is subjected to the filtration of radon daughter element by a high-efficiency filter, then continuously pumped into a measurement chamber and discharged to the outside; new daughter element 218Po generated by radon decay in the measurement chamber is adsorbed to the surface of a semiconductor detector under the action of strong electric field, electric signals, which are generated by high energy alpha particles released by the further decay of the 218Po, is subjected to energy identification and then counted to obtain the concentration of the 218Po so as to obtain radon concentration; and the data of radon concentration obtained by measurement is then calculated by applying a specific algorithm, thus the change of radon concentration can be rapidly measured.

The invention relates to a device for collecting and measuring radon daughters in air and a using method thereof. The device comprises a purified water tank, a radon daughter collection chamber, a radon daughter measurement chamber, a PC (Personal Computer) acquisition card and a PC control measurement device; after the radon daughter collection chamber collects radon daughters, the radon daughters flow into the radon daughter measurement chamber as water; a probe in the radon daughter measurement chamber transmits the detected radioactive signals to the PC acquisition card; and the PC acquisition card is used for digitalizing the radioactive signals detected by the probe and then converting the digital radioactive signals into radioactive total amount or energy spectrum data for detection, analysis and processing of the PC control measurement device, thus obtaining the content of the radon daughters. The device breaks the tradition, and adopts a new radon daughter collection mode to realize instantaneous measurement and continuous measurement of the radon daughters. The device is reasonable in design and strong in practicability.

The invention discloses an equilibrium equivalent radon concentration calculating method based on a high-voltage corona sampling method. The technical scheme brought forward by the invention is as follows: first of all, a radon daughter element is sampled by use of the high-voltage corona sampling method, then alpha net areas which are corresponding to RaA(<218>Po) and RaC'(<214>Po) within a time period of ti=120 seconds to ti=320 seconds and a time period of ti=1200 seconds to ti=1600 seconds are measured by use of an alpha energy spectrum measuring system, and then an equilibrium equivalent radon concentration is solved by use of a formula. At the same time, the invention provides steps for solving a key parameter scale coefficient k by use of a comparison method. According to the invention, the equilibrium equivalent radon concentration calculating method based on the high-voltage corona sampling method is a calculation method which is accurate, highly efficient and easy to realize. The method can also be popularized for application in other radon daughter element measuring methods.

Disclosed is a method for measuring 222Rn (radon) and 220Rn daughters in the air by means of an alpha disperse spectroscopy. The method includes collecting radon daughters in the air on a filter film by an air sampling pump, and measuring alpha radioactivity on the filter film by means of the alpha energy disperse spectroscopy. During measuring in short measuring period, measuring period is 2-20 minutes, the number of periods is larger than or equal to three, the number of 222Rn and 220Rn daughters on the filter film at the starting measuring time can be calculated by means of counts of different characteristic peaks of various measuring periods, and concentration of the 222Rn and 220Rn daughters in the air can be reasoned. During measuring in long measuring period, the number of measuring periods is two, both the two measuring periods are 30-300 minutes, the number of 222Rn and 220Rn daughters on the filter film at the starting measuring time can be calculated by means of counts of different characteristic peaks of the two measuring periods, and concentration of the 222Rn and 220Rn daughters in the air can be reasoned.

The invention relates to a fast detection device and method for the radon decay based on radon daughter suppression, and relates to the technical field of nuclear radiation detection. The fast detection device for radon decay based on radon daughter suppression comprises a first scintillation chamber and a second scintillation chamber, wherein both the first scintillation chamber and the second scintillation chamber include a plurality of cylindrical and light-proof shells, the inner diameter of the shells of the first scintillation chamber is less than the inner diameter of the shells of thesecond scintillation chamber, the shells are laminated from the bottom up and sequentially connected, the inner cavity of each shell is internally provided with a plurality of partition plates, and the partition plate divides the inner cavity of the shell into a plurality of fan-shaped chambers. The invention mainly improves the existing radon measurement method on the principle and methodology for radon detection. According to the invention, a fast radon detection model is constructed based on the detection radon decay, the influence of radon daughters on the detection radon is suppressed toa great extent by using electrostatic collection, filter membrane filtering and the scintillation chambers of the specific structure, and <222>Rn and <220>Rn are effectively distinguished in one measurement through the scintillation chambers of different geometric sizes.

The invention puts forward an artificial radionuclide dissolvability monitoring method and apparatus. The method comprises the following steps: according pulse signals detected by a semiconductor detector, a 214Bi-214Po coincidence event is extracted; the pulse signals comprise alpha pulse signals and beta pulse signals, and artificial radionuclide concentration is calculated according to the pulse signals detected by the semiconductor detector and the extracted 214Bi-214Po coincidence event. Via use of the artificial radionuclide dissolvability monitoring method and apparatus provided in the invention, effects exerted on artificial radionuclide aerosol measurement by 214Bi-214Po can be eliminated at presence of radon and a radon daughter background, and measurement efficiency can be improved.