• 한국축산시설환경학회지
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• 제13권3호
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• pp.211-218
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• 2007

본 시험은 축분을 이용한 활성탄소를 제조하는 기술을 개발하고 이의 활용방안을 연구하여 축분의 처리방법을 다변화하고 제조된 활성탄소의 토양개량재, 악취흡착재 등 농업적 이용을 모색하기 위하여 악취제거시험 등을 수행하였으며 그 결과는 다음과 같다. 1. 가축분을 건조, 펠렛화 과정을 거친 후 $400^{\circ}C$에서 1시간 탄화처리하고 $750^{\circ}C$에서 1시간 활성화처리시 활성탄소가 제조되었다. 2. 축분의 회분 함량은 돈분퇴비가 11.9%로 낮았으나 계분퇴비 29.8%, 젖소깔짚 40.7%로 높았다. 휘발성물질은 젖소깔짚 11.6%, 계분퇴비 18.8%, 계분 31.0%, 돈분퇴비 22.3% 이었으나 육계깔짚은 49.8%로 높았다. 3. 축분활성탄소의 비표면적은 계분퇴비 259.8, 계분 209.8, 돈분퇴비 442.3, 젖소깔짚 $812.9\;m^2/g$으로 야자각 활성탄소 $1,040\;m^2/g$ 보다 낮았으며 미세기공의 크기는 육계깔짚 $5.02\;{\AA}$으로서 큰 반면 젖소깔짚은 $0.39\;{\AA}$으로 야자각 활성탄소와 비슷하였다. 4. 축분활성탄소의 요오드 흡착능력은 $530{\sim}580mg/g$으로 야자각 활성탄소의 1,000 mg/g 보다 낮았다. 5. 암모니아가스의 흡착율은 계분이나 계분퇴비로 만든 활성탄소가 가장 낮았으며 젖소깔짚 활성탄소가 가장 높았으며 계분퇴비 활성탄소는 20분 경에 흡착 포화에 도달하는 반면 젖소깔짚 활성탄소는 40분이 되어서 흡착 포화에 도달하였다. 6. 황화수소의 경우 휘발성물질이 비교적 많은 육계깔짚, 계분퇴비, 산란계분 등으로 만든 활성탄소에서 흡착율이 낮았으며 젖소깔짚 활성탄소에서 높았다.

• Journal of Radiation Protection and Research
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• 제47권1호
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• pp.16-21
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• 2022

Background: Epidemiological observations such as mental retardation, physical deformities, etc., in children besides different types of cancer in the adult population of the Malwa region have been reported. The present study is designed to get insight into the role of naturally occurring radioactive material (NORM) in causing detrimental health effects observed in the general population of this region. Materials and Methods: Deep soil samples were collected from different locations in the Malwa region. Their activity concentrations were determined using low-level background gammaray spectrometry. High efficiency and high purity germanium detector capped in a lead-shielded chamber having a resolution of 1.8 keV at 1,173 keV and 2.0 keV at the 1,332 keV line of ⁶⁰Co was used in the present work. Data were evaluated with Genie-2000 software. Results and Discussion: Mean activity concentrations of ²³⁸U, ²³²Th, and ⁴⁰K in deep soil were found to be 101.3 Bq/kg, 65.8 Bq/kg, and 688.6 Bq/kg, respectively. The mean activity concentration of ²³⁸U was found to be three and half times higher than the global average prescribed by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). It was further observed that the activity concentration of ²³²Th and ⁴⁰K has a magnitude that is nearly one and half times higher than the global average prescribed by UNSCEAR. In addition, the radioisotope ¹³⁷Cs which is likely to have its origin in radiation fallout was also observed. It is postulated that the NORM present in high quantity in deep soil somehow get mobilized into the water aquifers used by the general population and thereby causing harmful health problems. Conclusion: It can be stated that the present work has been able to demonstrate the use of low background gamma-ray spectrometry to understand the role of NORM in causing health-related effects in a general population of the Malwa region of Punjab, India.