Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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A study on the optimal conditions for latent fingerprint development using cyanoacrylate fuming method in vacuum chamber

시아노아크릴레이트 진공 훈증법에 의한 잠재지문 현출 최적화에 관한 연구

  • Yu, Je-Seol (Soonchunyang Univ. Graduate School of Forensic Science) ;
  • Jung, Jin-Sung (Soonchunyang Univ. Graduate School of Forensic Science) ;
  • Lim, Seung (Scientific Investigation Section, Gyungnam Provincial Police Agency) ;
  • Park, Sung-Woo (Department of Scientific Investigation, National Police Agency)
  • 유제설 (순천향대학교 법과학대학원) ;
  • 정진성 (순천향대학교 법과학대학원) ;
  • 임승 (경남지방경찰청 과학수사계) ;
  • 박성우 (경찰청 과학수사센터)
  • Received : 2012.02.28
  • Accepted : 2012.06.04
  • Published : 2012.06.25
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Abstract

Cyanoacrylate fuming mehod is effective for latent fingerprints developing on non-porous surfaces. In this study, we investigated optimal conditions for latent fingerprint development using cyanoacrylate fuming method in vacuum chamber. The effects of temperature, relative humidity, fuming method and processing time were checked throughly. The amount of evaporated cyanoacrylate was increased at higher temperature, but cyanoacrylate polymerization on the fingerprint ridge was best at $30^{\circ}C$. With a relative humidity of 40% to 50% conditions, good quality of fingerprints were developed. If a relative humidity is lower than 30% or higher than 60%, polymerization rate of cyanoacrylate monomers on the fingerprint ridge was decreased. It was identified that application of $OMEGA-PRINT^{TM}$ dispersal pad or cotton ball with sodium hydroxide fuming method in vacuum chamber was more effective than natural fuming method. We found that cyanoacrylate processing time in vacuum chamber did not have more significant than relative humidity.

시아노아크릴레이트 훈증법은 비다공성 표면에 유류된 잠재지문을 현출할 때 효과적이다. 본 연구는, 진공챔버에서 시아노아크릴레이트를 훈증할 때 온도, 습도, 훈증 방법 등이 잠재지문 현출에 미치는 영향을 확인한 후 최적 반응 조건을 찾는데 있다. 진공챔버의 온도가 높을수록 시아노아크릴레이트 증발량은 증가했지만, 지문 융선에서 시아노아크릴레이트의 중합반응은 $30^{\circ}C$에서 가장 잘 일어났다. 상대습도가 40%, 50% 조건에서는 좋은 상태의 지문이 현출되었지만, 30%보다 낮거나 60%보다 높은 조건에서는 지문 융선에서 시아노아크릴레이트 중합반응 속도가 느려졌다. 진공챔버에서 시아노아크릴레이트를 자연적으로 증발시키는 방법보다는 $OMEGA-PRINT^{TM}$ dispersal pads와 수산화나트륨을 포함한 솜을 이용해 시아노아크릴레이트 훈증하는 방법이 효과적이란 사실을 확인할 수 있었다. 진공챔버에서 시아노아크릴레이트 처리시간은 상대습도에 비해 큰 영향을 주지 않았다.

Keywords

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