• 대한방사선방어학회:학술대회논문집
• /
• 2010.04a
• /
• pp.186-187
• /
• 2010

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
• /
• 2004.05a
• /
• pp.185-189
• /
• 2004

즉석 햄버거 스테이크의 초기 호기성 총균수는 약 5 log CFU/g 이었으나, 5 kGy이상의 감마선 조사에 의해 모두 사멸되었으며, 20 kGy로 조사한 햄버거 스테이크에서는 저장 4개월까지 어떠한 미생물의 생육도 관찰되지 않았다. 총균수가 $10^6{\sim}10^7$ log CFU/g에 이르렀을 때를 저장한계로 보았을 때, 냉장 저장시 비조사구는 14일인 반면, 5 및 10 kGy 조사구는 각각 28-42, 98-112일이었다. 감마선 조사에 의해 햄버거 스테이크의 지질 산화 및 이취 생성이 촉진되었으나, 로즈마리 분말을 첨가 하였을 때 지질 산화가 억제되고 냉장 저장 중 관능적 특성이 향상되었다. 감마선 조사와 로즈마리 분말의 병용처리는 즉석 햄버거 스테이크의 안전성 및 품질개선에 효과적인 것으로 사료되며, 이러한 결과는 조사취 및 지질 산화로 감마선 조사선량이 제한되는 다른 식품에도 적용될 수 있을 것으로 기대된다.

• Journal of the Korean Society of Food Science and Nutrition
• /
• v.30 no.4
• /
• pp.600-604
• /
• 2001

Immunoassay was used to study the detection method of irradiated shrimp. Sandwich ELISA was formatted with monoclonal antibody (Ab) (M-IgG) and polyclonal Abs (P-IgG) and polyclonal Abs (P-IgG) individually produced against brown shrimp tropomyosin (TPM) as an antigen. When M-IgG was used as a coating Ab to capture TPM, and P-IgG were used as reaction Ab against captured TPM could be detected in the range of 12.5 to 50 $\mu\textrm{g}$/mL. Detected concentrations of TPM from irradiated shrimp decreased dose-dependently, and the concentration of Ag by combination of irradiation with heating or freezing treatments also decreased. This results suggests the possibility for Sandwich ELISA, one of immunological analyses, to be applied for detecting irradiated shrimp.

• Nuclear Engineering and Technology
• /
• v.17 no.1
• /
• pp.1-7
• /
• 1985

Non-destructive gamma-ray spectrometry was carried out on the spent PWR fuel assemblies at the spent fuel pool of reactor-site. Attention was focused on the determination of burnup distribution and cooling time. For the measurement of burnup distribution, the concentration ratio of $^{134}$ Cs$^{137}$ Cs was used and the results showed these ratios varied with the positions of assemblies in the core during their irradiation. For the measurement of cooling time, $^{144}$ Ce$^{137}$ Cs was used and the results were agreed considerably well with the operator declared cooling time.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2016.10a
• /
• pp.937-939
• /
• 2016

In this study, we studied the gamma-radiation effect of fiber Bragg gratings (FBGs) manufactured by array sensors. The array FBGs were fabricated in a different Bragg wavelength using the same commercial Ge-doped fiber and exposed to gamma-radiation up to a dose of about 100 kGy at the dose rate of 113 Gy/min. It was analyzed radiation effects by measuring the radiation-induced change in the temperature sensitivity coefficient and Bragg wavelength shift after irradiation.

• Journal of Astronomy and Space Sciences
• /
• v.22 no.4
• /
• pp.377-384
• /
• 2005

Since gamma-ray bursts(GRBs) have been first known to science societites in 1973, many scientists are involved in their studies. Observations of GRB afterglows provide us with much information on the environment in which the observed GRBs are born. Study of GRB afterglows deals with longer timescale emissions in lower energy bands (e.g., months or even up to years) than prompt emissions in gamma-rays. Not all the bursts accompany afterglows in whole ranges of waveleogths. It has been suggested as a reason for that, for instance, that radio and/or X-ray afterglows are not recorded mainly due to lower sensitivity of detectors, and optical afterglows due to extinctions in intergalactic media or self-extinctions within a host galaxy itself. Based on the idea that these facts may also provide information on the GRE environment, we analyze statistical properties of GRB afterglows. We first select samples of the redshift-known GRBs according to the wavelength of afterglow they accompanied. We then compare their distributious as a function of redshift, using statistical methods. As a results, we find that the distribution of the GRBs with X-ray afterglows is consistent with that of the GRBs with optical afterglows. We, therefore, conclude that the lower detection rate of optical afterglows is not due to extinctions in intergalactic media.

• Food Science and Preservation
• /
• v.6 no.3
• /
• pp.286-291
• /
• 1999

This study was carried out to determine the effect of dose and timing of gamma irradiation and post-irradiation treatment with some preservatives of cut flowers on their longevity of rose and chrysanthemum. Cut roses which were soaked in 2% sugar solution persist to 0.75 kGy irradiation treatments. In post-treatments with some preservative solutions, the mixture group of 2% sucrose,2000m silver nitrate and 3.0% crysal were available in flower quality, but the 200 ppm silver nitrate solution treatment showed serious blackening of floral stems and resulted On negative effect in flower quality. Effect of gamma irradiation and all preservative solutions on the cut mum longevity were showed almost same tendency with rose cut flower longevity experiments. The 2% sugar dipping solution in mum cut flower showed the most superior preservative effect compared with the my other preservative solutions tested. Also non-irradiated treatment extended to flower up to complete wilt.

• Bulletin of the Korean Space Science Society
• /
• 2011.04a
• /
• pp.20.3-20.3
• /
• 2011

감마선폭발 (Gamma Ray Burst) 사건에서 아직 관측이 안되고 있는 초기 방출 광자에 대한 연구를 위하여 Ultra Fast Flash Observatory (UFFO) 인공위성 프로젝트가 제안되었다. 이 탑재체의 주요 기기로써, 감마선 폭발의 위치를 측정하기 위하여 coded mask 기반의 X-ray 광시야각 망원경인 UFFO Burst Alert X-ray Trigger Telescope (UBAT)와 감마선 폭발의 자외선 및 가시광 초기 후광관측을 위한 Slewing Mirror Telescope(SMT)가 있다. UFFO 프로젝트는 한국이 주도하고 미국, 대만, 러시아, 덴마크, 스페인, 프랑스, 노르웨이, 폴란드가 참여하는 9개국 국제공동연구이며, 2011년 11월 UFFO pathfinder가 러시아 인공위성인 Lomonosov에 실려 발사될 예정이다. 차세대 UFFO-100는 2015년 발사 목표로 연구가 시작되고 있다. UFFO pathfinder의 현재 진행상황과 가능한 연구에 대하여 논의한다.

• Nuclear Engineering and Technology
• /
• v.6 no.3
• /
• pp.151-154
• /
• 1974

The possibility of using natural beryl thermoluminesence for gamma-ray dose measurement was investigated through the analysis of glow curves obtained with Co-60 gamma-ray irrediation. The natural beryl powder of 80-200 mesh has a good gamma-ray thermoluminescent response and stability at room temperature. The thermoluminescent response is linear from 10mR to 10$^3$R and can be measured up to 10$^{6}$ R.

• Proceedings of the Korean Nuclear Society Conference
• /
• 1998.05b
• /
• pp.509-514
• /
• 1998

ORIGEN-S 전산코드로 계산된 가압경수로(PWR)사용후핵연료 내에 존재하는 방사성핵종비 $^{134}$ Cs/$^{137}$Cs 및 $^{154}$ Eu/$^{137}$Cs 를 감마선 분광실험으로 측정한 값과 비교하여 핵연료의 연소도를 결정하였다. 고리 1호기 및 2호기 사용후핵연료봉에 대한 감마선 분광실험을 한국원자력연구소 조사재시험시설(IMEF)과 조사후시험시설(PIEF)의 시험기기 및 장치를 이용하여 수행하고 이 결과로부터 $^{134}$ Cs/$^{137}$Cs 와 $^{154}$ Eu/$^{137}$Cs 의 핵종비를 측정하였다. 이와 별도로 사용후핵연료의 연소도, 냉각시간, 초기농축도등에 따른 $^{134}$ Cs/$^{137}$Cs 와 $^{154}$ Eu/$^{137}$Cs의 핵종비를 ORIGEN-S 코드로 계산을 하였으며, 이 핵종비와 연소도 사이의 관계를 회귀분석하여 2차 다항식 함수로 유도하였다 이관계식과 감마선 분광실험으로 측정한 $^{134}$ Cs/$^{137}$Cs와 $^{154}$ Eu/$^{137}$Cs 의 핵종비를 이용하여 각각의 연소도를 결정할 수 있었다.