Abstract:
Disclosed herein are a method and an apparatus to identify alpha-emitting radionuclides and to measure absolute alpha radioactivity using a low temperature detector. A 4&pgr; metallic absorber which encloses a radioactive material containing alpha-emitting radionuclides absorbs the total alpha decay energy in the form of thermal energy. The corresponding temperature changes are measured by a low temperature detector attached to the 4&pgr; absorber with high energy resolution. The identification of alpha-emitting radionuclides is declared by comparing the measured temperature signal with characteristic decay energy of radionuclides. The absolute amount of the radionuclides is determined by counting the number of the pulses for each of the identified nuclides.
Abstract:
본 발명은 홀을 갖는 자기양자센서용 흡수체 및 그 정렬방법에 관한 것으로, 특히 흡수체에 레이저로 홀을 가공하여 온도센서의 부착시 뿐만 아니라 이 온도센서를 픽업 루프 코일에 부착시 그 중심점으로서 이용할 수 있게 함으로써, 흡수체에 부착된 온도센서를 픽업코일의 중앙 부분에 위치하도록 정렬시킬 수 있게 되어 보다 정밀 측정이 가능하도록 한 홀을 갖는 자기양자센서용 흡수체 및 그 정렬방법을 제공하는데 그 목적이 있다. 이를 해결하기 위한 수단으로서 본 발명에 따르는 자기양자센서용 흡수체는, 자기양자센서용 흡수체(10)에 있어서, 흡수체(10)는 중앙에 정렬용 홀(11)이 형성되어 있는 것을 특징으로 한다. 또한, 본 발명에 따르는 홀을 갖는 자기양자센서용 흡수체의 정렬방법, 본 발명에 따르는 흡수체(10)의 상면에 온도센서(20)를 위치시키는 제1단계; 온도센서(20)의 중심과 흡수체(10)의 홀(11) 중심을 일치시키고, 온도센서(20)를 흡수체(10)에 장착하는 제2단계; 온도센서(20)의 하부에 자기선속 검출수단(30)을 위치시키는 제3단계; 및 홀(11)의 상면을 중심을 자기선속 검출수단(30)의 픽업루프 코일에 장착하는 제4단계;를 포함하여 이루어진 것을 특징으로 한다. 홀, 자기양자센서, 레이저
Abstract:
A magnetic flux noise thermometer can measure the temperature of a sample of the cryogenic temperature range by measuring the magnetic flux with a superconducting quantum interference device. A magnetic flux noise thermometer, which is composed of the SQUID(Superconducting Quantum Interference Device,20), measures the temperature of a sample(10) with the equation, T=8N^2z^2/(mu0)^2pisigma(kB)dr^4(sigma: the conductivity of the sample, d: the thickness of the sample, N: magnetic flux noise generated due to random thermal movement of electrons in the sample, as apart from the sample by z and shown in the radius of r, mu0: the magnetic permeability of the sample at the vacuum, and kB: the Boltzmann constant).
Abstract:
PURPOSE: An internal calibration source of a liquid detector is provided to analyze the size of output signals of multiplier phototubes according to the amount of flashes, thereby detecting energy of dark matters. CONSTITUTION: An internal calibration source(30) of a liquid detector(100) comprises a tube. The liquid detector includes a body(10) and a plurality of multiplier phototubes(20). Fluid xenon(X) is charged inside the body. The multiplier phototubes are arranged on the exterior surface of the body in all directions. The calibration source is point-line source and formed by coating correction materials on a wire. The wire is inserted into the tube. Both ends of the tube are sealed up with lead. The wire is formed of tungsten materials, and the tube is formed of a stainless materials.
Abstract:
An absorber with a hole for a magnetic quantum sensor and an aligning method thereof are provided to enable more accurate measurement by fabricating a hole in the absorber through a laser and using the hole as a center point in attaching a temperature sensor to a pickup loop coil. A temperature sensor(20) is located at a top surface of an absorber(10). The center point of the temperature sensor is coincided with the center point of a hole(11) formed in the absorber. The temperature sensor is mounted to the absorber. A magnetic flux detecting unit(30) is located at a lower part of the temperature sensor. A pickup loop coil of the magnetic flux detecting unit is mounted to the center point of the hole in the absorber.
Abstract:
A method for measuring absolute alpha radioactivity and identifying alpha-emitting-radionuclides using a low temperature detector and an apparatus using the same is provided to measure absolute alpha radioactivity accurately and identify alpha-emitting-radionuclides accurately by preventing alpha energy from being emitted outside. A method for measuring absolute alpha radioactivity and identifying alpha-emitting-radionuclides using a low temperature detector comprises following steps. An aurum foil formed sealing sample is prepared(S100). The aurum foil is set up at the low temperature detector(S200). The temperature signal according to the temperature change is obtained from the low temperature detector(S300). The amount of absolute radiation of radionuclide is measured from the temperature signal and the nuclide is determined(S400).