Results 271 to 280 of about 261,370 (287)
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Investigation of proton response of CR-39
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993Abstract CR-39 type super grade PM-355 samples have been irradiated at normal incidence with monoenergetic protons at selected energies in the range of 0.2 to 5 MeV. The sensitivity function and its variation with energy have been experimentally determined.
M.I. Al-Jarallah +4 more
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Investigation on a modified CR-39 microfilter
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1986Abstract A modified CR-39 microfilter with funnel-shaped pore entrances is produced by using a multi-step etching procedure with NaOH and PEW x solution ( PEW x = 15 g KOH + x g C 2 H 5 OH + (85 - x ) g H 2 O ) as etching agents. The air throughput through this microfilter is measured and compared with the CR-39 microfilter with ...
M. Berndt +3 more
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Alkaline erosion of CR 39 polymer surfaces
Radiation Physics and Chemistry, 2009We have investigated the mechanism of erosion of CR 39 polymer in alkaline environments. We observed the kinetics of absorption of water and methanol into both unirradiated and γ-irradiated samples. We use a capillary model to interpret our results. We etched our samples in both KOH solutions, and KOH solutions doped with methanol.
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CR-39 as a gamma ray dosimeter
Nuclear Tracks and Radiation Measurements (1982), 1984Abstract CR-39 has been exposed to doses of 60 Co gamma-rays in the range 500 Grays to 10,000 Grays (50 K Rad to 1 M Rad). Changes in bulk etch-rate were observed throughout this range, showing that CR-39 is more sensitive to gamma doses than other SSTR materials. The damage was found to be dose-rate dependent, the effect per unit dose being larger
A.N. Asfar, P.G. Clay, J.G. Williams
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Radon surveys in Brazil using CR-39
Radiation Measurements, 2005In this work results of two radon daughters survey in Brazil are presented and discussed. Some methodological problems concerning the first survey are pointed out which were corrected for the second survey in order to make a realistic long-term measurement of radon decay products in the air.
Paulo, SR +6 more
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การปรับปรุงกระบวนการปรับเทียบสำหรับการวัดก๊าซเรดอนด้วยพลาสติก CR-39
การปรับปรุงกระบวนการปรับเทียบสำหรับการวัดก๊าซเรดอนด้วยพลาสติก CR-39 พบว่า ควรเก็บพลาสติก CR-39 ไว้ในช่องแช่แข็งอุณหภูมิ -20 oC เสมอ สำหรับตลับวัดชุดควบคุมควรเก็บในโถดูดความชื้นทำสุญญากาศ เงื่อนไขการขนส่งคือควรบรรจุตลับวัดในถุงพลาสติก ทำสุญญากาศและบรรจุในถุงซิปอะลูมิเนียมอีกหนึ่งชั้น ถังปรับเทียบที่ออกแบบสร้างขึ้นใหม่ทำจากเหล็กไร้สนิมความหนา 4 มิลลิเมตรopenaire +1 more source
A CR-39 based thermal neutron dosimeter
Radiation Measurements, 1997Both chemically and electrochemically etched CR-39 detectors are used for the detection of fast neutrons. In practical situations, fast neutrons are always accompanied by thermal neutrons. Therefore, the response of the CR-39 based dosimeter has to be extended to thermal neutrons. To do so, a radiator/converter like LiF is introduced in front of the CR-
N. Ahmad, null Matiullah, M.A. Kenawy
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Presoak studies with CR-39 and Lexan
Nuclear Tracks and Radiation Measurements, 1993Abstract CR-39 from American Acrylics and Lexan from General Electric were placed in REM AT-100 radon detectors and exposed in a radon chamber. The foils were loaded in Hankins-type ECE cells and warmed in the oven, either dry or filled with presoak solution. The CR-39 showed a 17% increase in sensitivity after a 3-hr water presoak and a 22% increase
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Alpha-Particle Response Characteristics of CR-39
Isotopenpraxis Isotopes in Environmental and Health Studies, 1987The form of the response curve of CR-39 for α-particles at relatively low energies has been established. The investigation included measurements of both bulk- and track-etch rates. The latter was measured as a function of α-particle energies.
A. A. Abou El-Khier +3 more
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Etching processes in CR-39 and Lexan
International Journal of Radiation Applications and Instrumentation. Part D. Nuclear Tracks and Radiation Measurements, 1991Abstract The use of plastic materials as particle track detectors is based on the dispersion of the velocity by which the two-phase boundery system solid/fluid (detector-material/etch-solution) shifts along the track and the undisturbed bulk material.
J. Dethlefs, G. Siegmon, W. Enge
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