Alpha particles detection

Ikebe et al., 1984) are useful for precise measurements of low level radon, they are too expensive to make long-term measurements at numerous locations. The bare track detectors had been studied before the two other types of detectors were developed (Rock et al., 1969 Alter and Fleischer, 1981). The devices are suitable for measurements in a large number of dwellings, because the detectors are very inexpensive and can be sent and set up easily. The materials used for alpha particle detection are an allyl diglycol... 

Dead time considerations in the alpha particle detection limit the count rate, and hence limit the neutron flux that can be used with this approach. This means that large scan times will probably be required with most implementations of this approach. 

The incorporation of associated alpha particle detection in a sealed tube neutron generator (STNG) appears to severely aggravate the concerns over the limited neutron flux and tube lifetime previously detailed for STNG FNA approaches. A mean time to failure of some APSTNGs at a neutron flux of lO n/s is about 200 h [24]. Work is continuing to improve this mean time to failure. 

Kazuaki, T., Nishinaka, I, Asai, M., Goto, S., Sakama, M., Haba, H., Ichikawa, S., Nagame, Y., Schadel, M. Automated Liquid Chromatography Apparatus Coupled with an On-line Alpha-Particle Detection System . In 2nd International Symp. on Advanced Sci. Res., Advances in Heavy Element Research - ASR-2001 , Tokai, Ibaraki, Japan, Nov. 13-15, 2001 http //asr.tokai.jaeri.go.jp/asr2001/abstract/Tsukada.pdf... 

There are many accounts of alpha particle detection instruments for the measurement of Rn (Sedlet, 1966). Lucas (1957) was one of the first to develop a very low background counting system. Higgins et al. (1961) adapted the method for well-water Rn and Ra surveys. Peacock and Williamson (1962) developed a shallow-borehole probe using ZnS(Ag) that could make in-situ Rn determinations without the use of a pump, but required a 5 cm diameter light-proof hole into which the ZnS(Ag)-coated Incite rod and photomultiplier assembly was inserted. Rushing et al. (1964) used a similar technique for the determination of Rn in effluents and environmental samples. For U prospecting, Dyck (1969) and Allen (1976) applied a Lucas-type cell to determine Rn in soil, lake waters and stream waters. 

Figure 9.13 Four examples of response functions (a) 5-MeV Alpha particles detected by a silicon surface barrier detector (Chap. 13), or 20-keV X-rays detected by a Si(Li) reactor (Chap. 12). ib) 1-MeV Gamma ray detected by a NaI(Tl) crystal (Chap. 12). (c) 1-MeV Electrons detected by a plastic scintillator (Chap. 13). (

Alpha Particle Detection by Nanocrystalline Inorganic Scintillators... 

Figure 2. Pulse height spectra from alpha particle detection by CdSe/ZnS core/shell and Yi gdCeojoO nanocrystals prepared by different methods.

Lao.9oCeo.ioP04 nanocrystals were surface modified with mixed surfactants a mixture of DDA and BEHP or a mixture of OA and BEHP. The surface modified nanocrystals were dispersed at SO wt % in polystyrene, forming translucent thick films on quartz discs. Pulse height spectra from alpha particle detection (Source Am) of nanocrystal samples superimposed with the result from a highly efficient plastic scintillator, BC-400 are presented in Figure 3. 

Any alpha particle detected in the scintillation cell produces a signal which is routed to a total count register and also to the 219 and 220 circuits shown in Fig. 13-7. 

He nuclear reaction analysis of deuterium in deuterated polymers is denoted as D( He,p)a or D( He,a)p for proton and alpha particle detection, respectively. 

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