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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 27, Number 4
JKCSEZ 27(4)
August 20, 1983 

 
Title
Electrodeposition of some Alpha-Emitting Nuclides and its Isotope Determination by Alpha Spectrometry

몇가지 알파입자 방출 핵종의 전해석출 및 알파 스펙트럼 측정에 의한 그의 동위원소 정량
Author
Key-Suck Jung, In-Suck Suh

정기석, 서인석
Keywords
Abstract
몇가지의 알파입자를 방출하는 핵종, 즉 악티늄족 원소들, 207Bi and 210Po을 전해석출하는 장치를 만들었다. 스텐레스 원판으로된 환원전극에 이 동위원소들을 석출했으며(석출부분 직경=18mm), 산화전극으로는 백금선을 썼다. 전해질로 염화암모늄을 쓰고, 초기 pH=4, 염소이온농도=0.6M이하, 용액부피=15ml로 하여 1.5암페어(전류밀도=0.59A/cm2)의 전류를 100분간 흘려주어 98.3%의 석출 회수율과 ±0.7%의 재현도를 얻었다. 석출된 시료의 알파스펙트럼을 측정한 결과 에너지 분리도로서 210Po=18.3keV, 234U=21.8keV 및 239Pu=36.0keV인 반치전폭(full width at half maximum)을 얻었다. 국산 천연우라늄(충북·괴산) 시료를 전해석출하여 그의 알파스펙트럼을 구한 결과 238U : 234U = 1 : 6.1×10-5을 얻었으며 1.8×1013 neutrons/cm2·sec인 중성자속으로 144일 동안 쪼여준 238U 시료를 전해석출하여 그의 알파스펙트럼을 구한 결과 238U : 239Pu : 241Am = 100 : 0.0263 : 5.20×10-5을 얻었다. 조사시료중의 238U에 대한 본실험의 정량결과는 고체형광측정법 및 질량 스펙트럼법에 의한 결과들과 상대오차 1.6% 이내에서 일치하였으며, 239Pu의 경우는 음이온교환분리-알파스펙트럼 측정 및 삼불화테노일아세톤(thenoyltrifluoroacetone)을 쓴 용매추출-알파스펙트럼 측정에 의한 정량결과들과 상대오차 ±4.0%이내에서 일치하였다.

An apparatus was made for the electrodeposition of alpha emitting actinide nuclides, 207Bi and 210Po. The electrodeposition was made on a polished stainless steel plate cathode. The anode was made of platinum wire and to stir the solution. With the ammonium chloride as electrolyte initial pH = 4, chloride concentration = 0.6M and solution volume = 15ml, a current of 1.5 ampere(current density = 0.59A/cm2) was flowed for 100 minutes for the quantitative recovery of electrodeposition and on average recovery of 98.3% was obtained within ±0.7% uncertainty. Alpha spectrometry of the electrodeposited sample showed alpha peaks from 210Po, 234U and 239Pu having energy resolution (FWHM) of 18.3, 21.8 and 36.0 keV respectively. The electrodeposition and alpha spectrometry for a natural uranium sample of domestic origin gave 238U : 234U = 1 : 6.1×10-5 and for a neutron-irradiated uranium sample did 238U : 239Pu : 241Am = 100 : 0.0263 : 5.20×10-5. The result of 238U determination in the irradiated sample by electrodeposition-alpha spectrometry was in accord within ±1.6% of relative error with the results of solid fluorimetry and mass spectrometry. For 239Pu the result of electrodeposition-alpha spectrometry was in accord within ±4.0% of relative error with the results of anion exchange separation and the thenoyltrifluoroacetone(TTA) extraction both followed by alpha spectrometries.

Page
279 - 286
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