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Microwave Processing for Recovery of C-14 From Spent Ion Exchange Resin
Ga-Yeong Kim,Ki-Rak Lee,Hwan-Seo Park,Geun-il Park,Hyeon-Oh Park,Gi-Hyeon Kwon 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2
Ion exchange resins are commonly employed in the treatment of liquid radioactive waste generated in nuclear power plants (NPP). The ion exchange resin used in NPP is a mixed-bed ion exchange resin known as IRN-150, which is of nuclear grade. This resin is a mixture of cation exchange resin and anion exchange resin. The cation exchange resin removes cationic radionuclides such as Cs and Co, while anion exchange resin handles anions (e.g., H14CO3 -), effectively purifying the liquid waste. Spent ion exchange resins (spent resin) containing C-14 are classified as low and intermediate level radioactive waste, and their radioactivity needs to be reduced as it exceeds the disposal limit regulated by law. Therefore, the microwave technology for the removal of C-14 from spent resin has been investigated. Previous studies have successfully developed a method for the effective removal of C-14 during the resin treatment process. However, it was observed that, in this process, functional groups in the resin were also removed, resulting in the generation of off-gases containing trimethylamine. These off-gases can dissolve in water from process, increasing its pH, which can subsequently hinder the recovery of C-14. In this study, we investigated the high-purity recovery of C-14 by adjusting the moisture content within the reactor following microwave treatment. Mock spent resins, consisting of 100 g of resin with HCO3 - ion-exchanged and 0, 25, or 50 g of deionized water, were subjected to microwave treatment for 40 or 60 minutes. Subsequently, the C-14 desorption efficiency of the mock spent resins was evaluated using an acid stripping process with H3PO4 solution. The functional group status of the mock spent resins was analyzed using 15N NMR spectroscopy. The results showed that the mock spent resins exhibited efficient C-14 recovery without significant functional group degradation. The highest C-14 desorption efficiency was achieved when 25 g of deionized water was used during microwave treatment.
Selective Treatment of C-14 in Spent Ion Exchange Resin From HWR Using the Microwave
Ga Yeong Kim,Ki Rak Lee,Hwan-Seo Park,Geun-il Park,Hyeon-Oh Park,Gi-Hyeon Kwon 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1
Mixed-bed ion exchange resin consist of anion exchange resin and cation exchange resin is used to treat liquid radioactive waste in nuclear power plants. C-14 from heavy water reactors (HWR) is adsorbed on the anion exchange resin and is considered intermediate-level radioactive waste. The total amount of radioactivity of C-14 in spent ion exchange resin exceeds the activity limits for the disposal facility. Therefore, it is necessary to reduce the radioactivity through pre-treatment. There are thermal and non-thermal methods for the treatment of spent ion exchange resin. However, destructive methods have the problem of emitting off-gas containing radionuclides. To solve this challenge, various methods have been developed such as acid stripping, PLO process, activity stripping, thermal treatment and others. In this study, spent ion exchange resin (spent resin) was treated using microwave. The reaction characteristics of the resin to microwave were used to selectively remove the C-14 on the functional groups. Simulated spent anion exchange resin and spent resin from Wolseong NPP were treated with the microwave method, and the desorption rate was over 95%. An integrated process system of 1 kg/batch was built to produce operating data. After the operation of the process, characterization and evaluation of post-treatment for condensate water and adsorbent used in the process were performed. When the process system was applied to treat simulated spent resin and real spent resin, both showed a desorption rated of more than 97%. It means that the C-14 was successfully removed from the radioactive spent resin.
[P446] Blue toe syndrome mistaken for senile purpura
( Ga-hye Na ),( Do-hyeon Kim ),( Soo-hyeon Noh ),( Eun-jung Kim ),( Kun Park ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Blue toe syndrome (BTS) is often defined as the development of blue or violaceous discoloration in one or more digits. Initial cutaneous signs of BTS are usually non-specific, including intermittent pain, firm nodule localized to the lower leg, livedo reticularis, petechial, and purpura. A 82-year old woman presented with a 2-month-history of multiple purpuric patch on both leg with intermittent pain. In physical examination, both dorsalis pedis arteries were normally palpated. At first, the patient was diagnosed as senile purpura. After 2 weeks, she presented with increasing pain, ulceration, and black discoloration on multiple toes and heel. Radiologic examination revealed thinning of leg blood vessels with cholesterol thrombus on aorta. Based on clinical and radiologic findings, she was finally diagnosed as blue toe syndrome. And she underwent toe amputation for gangrenous change of toes. Here, we report a case of blue toe syndrome mistaken for senile purpura because this case highlights the importance of early diagnosis of blue toe syndrome
( Ga-hye Na ),( Do-hyeon Kim ),( Soo-hyeon Noh ),( Eun-jung Kim ),( Kun Park ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Some authors found that about 7% of basal cell carcinoma had a previous history of trauma. And basal cell carcinomas have been reported to develop within scars caused by surgery, laser ablation, and other injuries. A 65-year-old man presented with asymptomatic erythematous plaque on right mandible. Histopathologic findings revealed that buds and irregular proliferations of basaloid tumor cells attached to the undersurface of the epidermis. Four years earlier, he had presented with erythematous plaque on same site. Histologic examination of initial lesion was consistent with actinic keratosis, and this lesion was treated by cryosurgery and CO<sub>2</sub> laser ablation. Based on these findings, we diagnosed him as basal cell carcinoma arising from the scar of cryosurgery and laser ablation for a pre-existing actinic keratosis.
Hematoma beneath nail matrix after finger injury
( Ga-hye Na ),( Bo-ra Lim ),( Do-hyeon Kim ),( Soo-hyeon Noh ),( Eun-jung Kim ),( Kun Park ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
Fingertip injuries are commonly seen, and many of the cases are simple to treat and do not need specialized treatment. However, there are certain conditions where early intervention is warranted for better functional and aesthetic outcomes. A 54-year old man presented with injured fingertip after crushing injury on left 2th finger. Inspection of the digit revealed bluish change of nail plate with erosion on proximal nail fold. Conventional radiograph showed multi-fragmentary fracture of the distal phalanx. After removal of nail plate, nail bed showed bloating. After incision on proximal nail fold, nail matrix showed bloody change with congestion. According to these findings, we diagnosed him as hematoma beneath nail matrix. Then, we incised the transverse line on nail matrix and remove hematoma beneath nail matrix. After this procedure, the patient didn`t complain of any pain. And nail plate showed normal growth without dystrophy. It is difficult to predict solitary nail matrix injury after fingertip injury. Nail matrix injury can cause persistent pain, disturb growth of normal nail plate, and increase the risk of infection. Therefore, evaluating nail matrix in fingertip injury is very important, especially accompanying significant injury to nail fold or digit. And injured nail matrix should be treated by appropriate method.
Cutaneous squamous cell carcinoma arising in a patient with neurofibromatosis type 1: a case report
( Ga-hye Na ),( Bo-ra Lim ),( Do-hyeon Kim ),( Soo-hyeon Noh ),( Eun-jung Kim ),( Kun Park ) 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.1
A 31-year-old man with a past history of neurofibromatosis type 1 presented with 2.5x1.5cm sized, exophytic tumor of back covered with crust and oozing. Histopathologic findings were consistent with poor differentiated squamous cell carcinoma. Neurofibromatosis type 1 (NF1) is an autosomal dominant inherited disease. It is known that the incidence of tumors in patients with NF1 is high compared with the normal population. And majority of the tumors are non-epithelial neoplasms, including neurofibromas, malignant peripheral nerve sheath tumors, gliomas and leukemia. Also, some studies have suggested that patients with NF1 also have a significantly higher risk of certain types of carcinomas, including breast cancer. However, the occurrence of cutaneous squamous cell carcinoma in a patient with NF1 is rarely reported and the association between NF1 and cutaneous squamous cell carcinoma is not established. Herein, we report a case of cutaneous squamous cell carcinoma occurring on the back of a 31-year-old man with neurofibromatosis type 1.
P074 Clinical experience of adapalene on molluscum contagiosum
( Ga-hye Na ),( Do-hyeon Kim ),( Soo-hyeon Noh ),( Jin-kyung Chae ),( Kun Park ),( Eun-jung Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Molluscum contagiosum (MC) is one of the most common viral skin infections in children. There are a variety of therapeutic modalities for this condition, including curettage, cryotherapy, and topical treatment. However, some patients are intolerable to these modalities, because these treatments often cause pain or irritation. Objectives: To evaluate the safety and efficacy of topical adapalene in treating MC. Methods: Thirteen patients with multiple MC lesions were treated with topical adapalene cream. The patients were evaluated every 2 weeks for clinical response to therapy as well as the presence of side effects. A post-treatment questionnaire was administered to evaluate the satisfaction of the patients’ parents with this therapy. Results: Of the 13 patients, 6 patients (45.2%) showed clearance of MC lesions. Over 70% of the patients’ parents noticed that topical application of adapalene was convenient. And side effects were observed in only 4 patients (30.7%), including mild erythema, dryness, and a burning sensation. The side effects were transient and tolerable in most cases. Conclusion: Adapalene is relatively convenient and safe treatment modality in MC. It will be an alternative treatment option in children who are intolerable to other treatments.