scholarly journals A Low‐Level Radon Counting System

1954 ◽  
Vol 25 (2) ◽  
pp. 153-157 ◽  
Author(s):  
G. L. Bate ◽  
H. L. Volchok ◽  
J. L. Kulp
Keyword(s):  
Counting System ◽  
Low Level

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

The HASL Ge(Li)-NaI(Tl) Low Level Counting System

1972 ◽  
Vol 19 (1) ◽  
pp. 141-150 ◽  
Author(s):  
Norman Latner ◽  
Colin G. Sanderson
Keyword(s):  
Counting System ◽  
Low Level

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 Low-Level Gas Proportional Counting in An Underground Laboratory

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 461-469 ◽  
Author(s):  
H H Loosli ◽  
Martin Heimann ◽  
Hans Oeschger
Keyword(s):  
Construction Material ◽  
Volume Effect ◽  
Underground Laboratory ◽  
Counting System ◽  
Low Level ◽  
Background Values ◽  
Selection Of ◽  
Gas Pressures

Results of measurements in an underground laboratory, 70m of water equivalent below surface, are given. Background values of proportional gas counters with volumes between 16cc and 1.5L are lower by a factor of 2—4.5 compared to the values in the previously used laboratory (7m w.e.). High counting gas pressures, up to 5 at CH4 and up to 36 at P-10, enable the use of relatively small counters with correspondingly small background contributions from the walls. A separation of the residual background into different components is attempted, distinguishing a pressure dependent volume effect and surface correlated contributions. It can be shown that the selection of radioactively pure counter construction material is very important for a good low level counting system.

scholarly journals Rehabilitation of the Laboratoire De Carbone 14-Dakar (Senegal) with a Super Low-Level Liquid Scintillation Counting System

Radiocarbon ◽  
2004 ◽  
Vol 46 (1) ◽  
pp. 117-122
Author(s):  
Maurice Ndeye ◽  
Oumar Ka ◽  
Hamady Bocoum ◽  
Alpha O Diallo
Keyword(s):  
Iron Age ◽  
Figure Of Merit ◽  
Liquid Scintillation ◽  
Background Level ◽  
International Standards ◽  
Liquid Scintillation Spectrometer ◽  
Energy Agency ◽  
Counting System ◽  
Low Level ◽  
Chronological Period

Following the passing of Prof Cheikh Anta Diop in 1986, the radiocarbon laboratory (LC14) he created 20 yr earlier at the Institut Francophone d'Afrique Noire (IFAN), Dakar, Senegal, fell into a long hibernation. It took nearly 3 yr to renovate the laboratory and reinstall new equipment in order to return LC14 to full functionality and resume its activity. A new dating system has been implemented around a super low-level liquid scintillation spectrometer from Packard, the Tri-Carb 3170TR/LS, located in an underground room.In this paper, we assess the performance of the dating setup (background level and figure of merit) using known samples from Paris 6 and international standards from the International Atomic Energy Agency (IAEA). After the calibration, the setup was used to study bolé seashells from the Khant area in the northern part of Senegal (West Africa). The aim is to present evidence of the correlation between the transgression of the Nouakchottan (5500 BP) and a few industries in the Khant area. The corresponding ages are difficult to assess and the dates available for this cultural site are randomly distributed, ranging from 4500 to 1500 BP, i.e., a chronological period spanning from the Neolithic to the Iron Age.

Efficient Low‐Level Counting System for C11

1958 ◽  
Vol 29 (12) ◽  
pp. 1104-1107 ◽  
Author(s):  
J. B. Cumming ◽  
R. Hoffmann
Keyword(s):  
Counting System ◽  
Low Level

scholarly journals Stability of a New, Multichannel, Low-Level Liquid Scintillation Counter System, Kvartett

Radiocarbon ◽  
1995 ◽  
Vol 37 (2) ◽  
pp. 727-736 ◽  
Author(s):  
Sigurđur Einarsson ◽  
Páll Theodórsson
Keyword(s):  
Count Rate ◽  
Liquid Scintillation ◽  
Scintillation Counter ◽  
Counting System ◽  
Background Count ◽  
Background Count Rate ◽  
Low Level ◽  
Quality Control Standard ◽  
Conventional Systems ◽  
Sample Vial

Kvartett is a new liquid scintillation counting (LSC) system for radiocarbon dating that takes a radical departure from conventional systems to obtain a compact, low-level counting system measuring four samples simultaneously. Each sample vial, inside the well of a large NaI(Tl) guard-counter crystal (facing down), sits on top of a vertical PMT. The fourfold counting capacity can be used to increase the number of samples being dated or to get higher precision. The increased throughput helps to keep a rigid quality-control standard. We monitored the background count rate almost continuously for 7 months, and measured the count rate of a standard repeatedly for 2 months. The results show the background and system reproducibility to be stable.

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