The upgrading of the cyclic neutron activation analysis facility at the Dalat research reactor

2017 ◽  
Vol 315 (3) ◽  
pp. 703-709 ◽  
Author(s):  
Van Doanh Ho ◽  
Manh Dung Ho ◽  
Thanh Viet Ha ◽  
Quang Thien Tran ◽  
Dong Vu Cao
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Research Reactor ◽  
Cyclic Neutron Activation Analysis ◽  
Dalat Research Reactor

scholarly journals Determination of trace elements in some fruits collected in Vietnam and Korea by Neutron Activation Analysis on Dalat and HANARO research reactors

2015 ◽  
Vol 5 (4) ◽  
pp. 23-29
Author(s):  
Thi Sy Nguyen ◽  
Manh Dung Ho ◽  
Van Doanh Ho ◽  
Quang Thien Tran ◽  
Sam Chung Yong
Keyword(s):  
Trace Elements ◽  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Research Reactor ◽  
Standard Samples ◽  
Long Time ◽  
Polyethylene Bags ◽  
Mn Concentrations

The k0-based neutron activation analysis (k0-NAA) has been applied for determination of trace multi-element in 5 fruits: Orange, tomato, persimmon, pear and apple. The samples were collected in Vietnam and Korea, and dried-frozen in laboratory at a temperature of -650C, weighed approximately 50 mg or 100 mg each sample, and put in clean polyethylene bags for short and long time irradiations, respectively. The NIST-1547 (Peach Leaves) and IAEA-V-10 (Hay Powder) were used for the purpose of quality control. Both analytical and standard samples were irradiated in the 500 kW Dalat research reactor (Vietnam) and the 20 MW HANARO research reactor (Korea). Concentration of 16 elements: Al, As, Au, Br, Ca, Cl, Co, Eu, Fe, K, La, Mg, Mn, Na, Rb and Zn were determined. By comparison the concentrations of trace elements in the investigated Vietnam and Korea’s fruits, revealed that they are mostly similar between two places. However, the Ca concentration in orange from Vietnam was approximately 2.5 times higher than that one from Korea, whereas the Ca concentration in pear from Vietnam was approximately 21 times lower than that one from Korea. The Mn concentrations in all of fruits that collected in Vietnam were mostly higher than those collected in Korea, ranging between 1.4 to 2.2 times.

Cyclic neutron activation analysis of biological and metallurgical samples

1981 ◽  
Vol 59 (11) ◽  
pp. 1660-1664 ◽  
Author(s):  
A. Chatt ◽  
K. N. Desilva ◽  
J. Holzbecher ◽  
D. C. Stuart ◽  
R. E. Tout ◽  
...  
Keyword(s):  
Neutron Activation Analysis ◽  
Activation Analysis ◽  
Neutron Activation ◽  
Detection Limits ◽  
Square Root ◽  
Cyclic System ◽  
Relative Standard ◽  
Cyclic Neutron Activation Analysis ◽  
Number Of Cycles

A rapid pneumatic transfer cyclic system for use with the SLOWPOKE reactor has been designed which allows detection of nuclides with half-lives as short as 0.8 s. Reliable reproducibility is achieved with a 1 s transfer period from reactor to detector. Both accuracy and relative standard deviation are significantly improved with some matrices as the number of cycles is increased but the gains in detection limits increase with the square root of the number of cycles. Cyclic instrumental neutron activation analysis has been successfully applied to the determination of Ag, F, Hf, Pb, Rb, Sc, and Se in a variety of biological and metallurgical matrices. The detection limits ranged from 0.01 to 2.2 ppm for all elements studied except Pb.

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