Rapid determination of Sr-89/Sr-90 in radwaste by low-level background beta counting system

1994 ◽  
Vol 45 (2) ◽  
pp. 251-256 ◽  
Author(s):  
Chu-Fang Wang ◽  
Jeng-Horng Lee ◽  
Horng-Jye Chiou
Keyword(s):  
Rapid Determination ◽  
Counting System ◽  
Low Level ◽  
Beta Counting

scholarly journals Radioactivity of some natural and artificial radionuclides in coastal seawater at Ninh Thuan, Ba Ria - Vung Tau and Ca Mau provinces in 2018

2021 ◽  
Vol 10 (2) ◽  
pp. 44-51
Author(s):  
Tung Nguyen Dinh ◽  
Sieu Le Nhu ◽  
Phuc Nguyen Van ◽  
Phu Nguyen Van ◽  
Khoa Tran Dinh ◽  
...  
Keyword(s):  
Radiochemical Separation ◽  
Physicochemical Parameters ◽  
Separation Method ◽  
Precipitation Method ◽  
Gamma Spectrometer ◽  
Counting System ◽  
Low Level ◽  
Coastal Seawater ◽  
Beta Counting ◽  
Alpha Spectrometer

Radioactivities of some natural (Ra-226, Th-232, U-238, Po-210) and artificial (Cs-137, Sr-90 and Pu-239,240) radionuclides in coastal seawater at monitoring points of Ninh Thuan, Ba Ria - Vung Tau and Ca Mau provinces were analyzed quarterly in the year of 2018. Radioactivities of Ra-226, Th-232, U-238, and Cs-137 had been determined by simultaneous precipitation method and measured on low-level background gamma spectrometer; the radioactivities of Po-210 and Pu- 239,240 had been analyzed by radiochemical separation method and measured on alpha spectrometer; the radioactivity of Sr-90 had been analyzed by radiochemical separation method and measured on low-level background beta counting system. The ranges of radioactivities of Ra-226, Th-232, U-238, Po-210, Cs-137, Sr-90, and Pu-239,240 were 2.71 ÷ 15.91, 3.45 ÷ 35.93, 3.02 ÷ 21.47, 1.51÷ 6.74, 0.88 ÷ 1.68, 1.08 ÷ 1.86 and 0.0026 ÷ 0.0062 mBq/L, with the average values of 6.37, 12.67, 8.34, 3.29, 1.36, 1.46 and 0.0043 mBq/L, respectively. The results shown that the radioactivities of theabove-mentioned radionuclides varied between the seawaters at Ninh Thuan, Ba Ria - Vung Tau and Ca Mau seawater. Additionally, physicochemical parameters in seawater were also surveyed to assess their impact on the fluctuations of the above radionuclides.

scholarly journals Low Background Liquid Scintillation Counting Using an Active Sample Holder and Pulse Discrimination Electronics

Radiocarbon ◽  
1989 ◽  
Vol 31 (03) ◽  
pp. 332-341 ◽  
Author(s):  
John E Noakes ◽  
Robert J Valenta
Keyword(s):  
Experimental Data ◽  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Background Radiation ◽  
Scintillation Counting ◽  
Sample Holder ◽  
Counting System ◽  
Low Background ◽  
Low Level ◽  
Beta Counting

A Packard low-level liquid scintillation counting system is described which provides superior low-background beta-counting capability for3H and14C. The design is based on a novel pulse-discrimination circuit that separates background from valid scintillation pulses. Background discrimination is further enhanced by adding a plastic vial holder that acts as an anticoincidence guard. When excited by background radiation, the scintillation properties of the plastic provide an increased burst of photons to the detection electronics, which discriminate based on the number of component pulses in the burst. Experimental data demonstrate the low-level counting capabilities of this counter.

scholarly journals Determination of Iodine-131 at Low Levels in Milk: Collaborative Study

2001 ◽  
Vol 84 (2) ◽  
pp. 507-511
Author(s):  
Edmong J Baratta ◽  
David G Easterly ◽  
S A Bell ◽  
C-S Cheng ◽  
J Daly ◽  
...  
Keyword(s):  
Limit Of Detection ◽  
Collaborative Study ◽  
Nuclear Regulatory Commission ◽  
Official Method ◽  
Gamma Energy ◽  
Counting System ◽  
Beta Counting ◽  
Iodine 131 ◽  
Regulatory Commission

Abstract The official method for the determination of iodine-131 in milk has a lower limit of detection (LLD) of 10 pCi/L (0.37 Bq/L). The Nuclear Regulatory Commission had recommended that a method claiming to have an LLD of <0.3 pCi/L (<1.1E-02 Bq/L) be used. That method, which is capable of measuring iodine-131 below the level of detection of the Official Method, was collaboratively studied. The method uses a palladium iodide precipitate to concentrate the iodine-131 and measures (counts) its 364 keV gamma energy in coincidence with the beta decay or with a low-background beta-counting system. The study was performed by using 3 concentrations of iodine- 131 in milk: 2.6, 5.0, and 8.0 pCi/L (9.62E-02, 1.85E-01, and 2.96E-01 Bq/L, respectively). Eleven laboratories agreed to participate in the study. Eight laboratories submitted data for the study. The averages of the results were 2.68, 5.30, and 8.12 pCi/L (9.92E-02, 1.96E-01, and 3.00E-01 Bq/L, respectively), respectively. The intra- and interlaboratory variations were acceptable. The method was adopted First Action by AOAC INTERNATIONAL.

scholarly journals Rapid Determination of Low-level Sulfite in Dry Vegetables and Fruits by LC-ICP-MS

2015 ◽  
Vol 21 (1) ◽  
pp. 1-6 ◽  
Author(s):  
Zhanglin Ni ◽  
Fubin Tang ◽  
Yihua Liu ◽  
Danyu Shen ◽  
Runhong Mo
Keyword(s):  
Rapid Determination ◽  
Low Level ◽  
Icp Ms ◽  
Vegetables And Fruits

Weak Beam Imaging and Diffraction Studies of Stacking Faults in Silicon

1976 ◽  
Vol 34 ◽  
pp. 590-591
Author(s):  
T. Y. Tan ◽  
W. K. Tice
Keyword(s):  
Fast Neutron ◽  
Rapid Determination ◽  
Stacking Faults ◽  
Imaging Method ◽  
Large Reduction ◽  
Dislocation Loops ◽  
Fringe Spacing ◽  
Weak Beam ◽  
Kinematical Theory

In studying ion implanted semiconductors and fast neutron irradiated metals, the need for characterizing small dislocation loops having diameters of a few hundred angstrom units usually arises. The weak beam imaging method is a powerful technique for analyzing these loops. Because of the large reduction in stacking fault (SF) fringe spacing at large sg, this method allows for a rapid determination of whether the loop is faulted, and, hence, whether it is a perfect or a Frank partial loop. This method was first used by Bicknell to image small faulted loops in boron implanted silicon. He explained the fringe spacing by kinematical theory, i.e., ≃l/(Sg) in the fault fringe in depth oscillation. The fault image contrast formation mechanism is, however, really more complicated.

Methods for rapid determination of pecan (Carya illinoensis) seed viability

2017 ◽  
Vol 45 (2) ◽  
pp. 455-464
Author(s):  
T.T. Xue ◽  
J. Liu ◽  
Y.B. Shen ◽  
G.Q. Liu
Keyword(s):  
Rapid Determination ◽  
Seed Viability ◽  
Carya Illinoensis
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