摘要:
Alpha particle detecting devices are disclosed that have a chamber that can hold a fluid in a tensioned metastable state. The chamber is tuned with a suitable fluid and tension such that alpha emitting materials such as radon and one or more of its decay products can be detected. The devices can be portable and can be placed in areas, such as rooms in dwellings or laboratories and used to measure radon in these areas, in situ and in real time. The disclosed detectors can detect radon at and below 4 pCi/L in air; also, at and below 4,000 pCi/L or 300 pCi/L in water.
摘要:
A system and method for recovering high value gas from a process stream, material or environment containing same, e.g., xenon by contacting gas from the process stream, material or environment with a carbon adsorbent effective to sorptively capture same, free of or with reduced concentration of fluid species present with the high value gas in the high value gas-containing gas in the process stream, material or environment. Other aspects of the disclosure include a radon detection method and product.
摘要:
One aspect of the present disclosure comprises a method for calibrating a drive level of a non-radioactive calibration source. Another aspect of the present disclosure comprises a method for using a non-radioactive calibration source to verify correct operation of a radiation detector. Another aspect of the present disclosure comprises a radiation detection system that comprises a radiation detector and a non-radioactive calibration source that is used to verify correct operation of the radiation detector.
摘要:
A gas sensor instrument comprises a housing formed of two parts (102, 10) and a diffusion chamber inside the housing. The diffusion chamber is formed from two parts (106, 108) and at least one of the diffusion chamber parts is formed integrally with one of the housing parts. This allows a reduction in size of the instrument without compromising the size of the diffusion chamber. Additionally, a tubular projection is formed integrally with one of the housing parts to form part of a Faraday cage for shielding an amplifier circuit of the instrument.
摘要:
A method and device for measuring radon by the electrostatic collection method without the influence of the environmental temperature and humidity is by reducing the pressure that in a electrostatic collection and measuring chamber to below a certain threshold value, in the operating temperature range of 0-45 degrees, and the air relative humidity of the external environment changing in 0%-400%, the collection efficiency of the collection and measuring chamber of the static electricity that collects positively charged 218Po particle to the surface of a semiconductor detector is basically unchanged, so when the temperature and humidity of the external environment change, the detection efficiency does not change; the threshold value relates to the geometric factor and the distribution of the electric field intensity that in different measuring chamber. The device comprises a measuring chamber, a semiconductor detector, a high-voltage module, a sampling pump, a vacuum gauge, and a regulating valve.
摘要:
A detection device is formed in a body of semiconductor material having a first face, a second face, and a cavity. A detection area formed in the cavity, and a gas pump is integrated in the body and configured to force movement of gas towards the detection area. A detection system of an optical type or a detector of alpha particles is arranged at least in part in the detection area.
摘要:
A device for measurement of the radiological activity in the bottom of an aqueous medium, comprising a sealed case for a radiological detector, means forming a truncated cone containing a material that allows radiation to be measured by said radiological detector to pass through it, comprising a short base and a long base, the long base forming an input face for the radiation to be measured, this cone being assembled to said case in a sealed manner, the short base being placed on the side of the detector input face, and the long base being designed to be placed facing the bottom of this aqueous medium.
摘要:
A radiation detector outputs an analog pulse for incident radiation, and a signal processing portion is furnished with a wave height measuring function of converting the analog pulse inputted therein to a digital form and then measuring a peak wave height of the analog pulse and a wave height spectrum measuring function of measuring a wave height spectrum on the basis of measured wave height data, computes a dose rate and mean energy on the basis of measured wave height spectral data, and outputs computation results. The signal processing portion computes the dose rate and the mean energy on the basis of the wave height spectral data in a same wave height range on a same time axis. It thus becomes possible to provide accurate information based on which to determine whether a rise in dose rate is contributed by natural radon and thoron or contributed by a reactor facility.
摘要:
An in situ method for detecting alpha particles contained in a liquid medium, which uses a system which includes a counter-electrode and an alpha particle detector including a substrate made of an intrinsic semiconductor material sandwiched between two electrical contacts, wherein the contact intended to be in contact with the liquid medium is made of boron-doped diamond. By forming a particular electrolyte 8 and by causing a current to flow between counter-electrode and the boron-doped diamond contact in contact with the liquid medium, actinides or polonium present in the liquid medium may be concentrated on the boron-doped diamond contact, and by this means the detection limit of the alpha emitters may be lowered.
摘要:
A method and an apparatus for detecting the remote origin fraction of 222Rn present in a measuring site (Z) for the monitoring of dynamic phenomena inside the land crust, comprising the following steps: a) analysis of the measuring site (Z) in order to state a typical ratio between 222Rn of local origin and 220Rn of local origin; b) measurement, at preset time intervals, of alpha spectroscopy in the measuring site (Z) by a measuring chamber (2); c) processing of said alpha spectroscopy in order to find the concentrations of 222Rn and 220Rn present in the measuring site (Z); d) determination of the concentration of 222Rn of local origin by multiplying the concentration of 220Rn with the typical ratio; subtraction of the concentration of 222Rn of local origin from the concentration of 222Rn to obtain the concentration of the remote origin fraction Of 222Rn.