Plutonium

Part 1 book "Nuclear chemical engineering" includes content: Plutonium and other actinide elements, fuel reprocessing, radioactive waste management, stable isotopes - uses, separation methods, and separation principles, separation of isotopes of hydrogen and other light elements, uranium isotope separation

661p muasambanhan09 04-03-2024 0 0   Download

This paper presents the steady-state analysis results of the OECD/NEA and U.S. NRC PWR MOX/UO2 (MOX: Mixed Oxide) Core Transient Benchmark with the modern MCNP6 Monte Carlo code based on the up-to-date ENDF/B-VII.1 nuclear data library.

9p vicedric 08-02-2023 8 3   Download

A comparison between stochastic and deterministic depletion calculations based on a graphite-filled MOX fuel assembly configuration is presented in this paper. The infinite multiplication factors and isotope inventory changes as a function of burnup obtained by Monte Carlo method module SCALE/KENO and deterministic method module SCALE/NEWT are compared with those obtained by deterministic code HELIOS. The impact in calculation results by using different nuclear data library is also investigated.

10p trinhthamhodang9 10-12-2020 10 0   Download

This paper discusses concepts for three-component fuel bundles containing plutonium, uranium and thorium for use in pressurised heavy water reactors, and cases for and against implementation of such a nuclear energy system in the United Kingdom.

12p christabelhuynh 30-05-2020 7 0   Download

At the end of the project 27 papers in peer reviewed journals were published and it is expected that the real number will be the double. The training and integration success was evidenced by the fruitful implementation of the Travel Fund as well as the unique schools, e.g. practical and theoretical handling of plutonium.

8p christabelhuynh 29-05-2020 9 0   Download

The main results of the research described are the following: (1) following the research on the influence of mixed fuel fission products (radioactive isotopes being formed during reactor operation as a result of nuclear decay of elements included into the fuel composition) on living organisms, the authors determined the quantities of plutonium dioxide (РuO2) that penetrated into blood and lay in the pulmonary region, liver, skeleton and other tissues.

11p minhxaminhyeu5 30-06-2019 20 1   Download

The article describes the results of experiments conducted on pigs to determine the effect of plutonium, which is the most radiotoxic and highly active element in the range of mixed fuel (U0.8Pu0.2)O2 fission products, on living organisms. The results will allow empirical prediction of the emergency plutonium radiation dose for various organs and tissues of humans in case of an accident in a reactor running on mixed fuel (U0.8Pu0.2)O2.

10p minhxaminhyeu5 30-06-2019 16 2   Download

The methodology uses measured values of intraelement isotope ratios of plutonium and fission product contaminants. MCNP radiation transport codes were used for various reactor core modeling and fuel burnup simulations. A reactor-dependent library of intra-element isotope ratio values as a function of burnup and time since irradiation was created from the simulation results.

10p minhxaminhyeu3 12-06-2019 9 0   Download

This study was found by simulating public information on Lightbridge’s fuel design for pressurized water reactors. This study explores the temperature profile and maximum stress within a simple (first generation design) hypothetical nuclear explosive device of four unique scenarios over time. Analyzing the transient development of both the temperature profile and maximum stress not only establishes a technical limit on the 238Pu content, but also establishes a time limit for which each scenario would be useable.

8p minhxaminhyeu3 12-06-2019 14 0   Download

In this study, investigation of spent fuel was performed using six group delayed neutron parameters. Three used fuels (F1, F2, and F11) which are burnt over the years in the core of Missouri University of Science and Technology Reactor (MSTR), were investigated. F16 fresh fuel was used as plutonium free fuel element and compared with irradiated used fuels to develop burnup and Pu discrimination method.

6p minhxaminhyeu3 12-06-2019 10 0   Download

Isotopic analyses of plutonium and low-enriched uranium mixtures with particle sizes of 0.6e3.3 mm were performed using thermal ionization mass spectrometry with a continuous heating method to verify its effectiveness for the accurate analysis of minor isotopes without sample pretreatment. The mixed particles used in this study were prepared from a mixed solution of plutonium (SRM 947) and uranium (U010, 235U 1% enriched) reference materials.

5p minhxaminhyeu3 25-06-2019 15 1   Download

The probability of Type-I error for the plutonium Material Unaccounted For (MUF) is evaluated by the hypothesis testing method as a function of the sizes of powder particles and granules, which are dominant parameters to determine the sample size. The results show the probability of Type-I error is occasionally greater than 5%. However, increasing granule sample sizes could surmount the weakness of material accounting because of the non-uniformity of nuclide composition.

11p minhxaminhyeu3 25-06-2019 13 0   Download

Dư luận bàn tán khá nhiều về nguy cơ của plutonium. Có ý kiến rằng plutonium là một đe dọa cho môi trường vì có chu kỳ (hay nửa đời) hơn 24.000 năm. Có ý kiến rằng plutonium là nguyên liệu cho bom nguyên tử nên là một đe dọa cho hòa bình Thế-giới.

9p doiduongbeach 13-05-2013 46 3   Download

Sau khi cho lên mạng ngày 19-9-2004 bài phỏng vấn “đối chất” ( débat contradictoire ) giữa GS Trần Hữu Phát ( từ trong nước ) và cá nhân tôi về Điện Hạt Nhân ở Việt Nam, tôi có nhận được của nhiều thính giả trong và ngoài nước một số câu hỏi liên quan đến các vấn đề sau đây : các kiểu lò , lò thế hệ IV, hiện trên thị trường trước 2035-204

15p doiduongbeach 13-05-2013 50 1   Download

Presently, India occupies a leading place among Asian nations in the indigenous design, development, construction, and operation of nuclear power reactors. Nuclear power generation in India is based on a three-stage plan to eventually make use of the abundant national resources of thorium, through the use of fast breeder reactors. To achieve this long-range goal, India had to necessarily start with setting up heavy water–moderated, natural uranium–fueled power reactors to produce the plutonium required for the subsequent stages....

29p hailedangbs 02-05-2013 34 3   Download

But we too will crumble, in the end. All political power comes to pass. Power cannot be stored forever, not even in plutonium. Nor, in the end and rendering unto Caesar, can there be any permanent money as a store of value over any significant time. This is the Law of the Inevitable Ephemerality of the Confederate Dollar. All gold turns biblically to dross; all Rhodesian dollars become Zimbabwean; all Money Fiats are Ford Edsels. The only issue is when. Power sharing always has financial costs. The economic rewards are ever temporary. Power and money are always Hobbesian:...

19p hoangphiyeah1tv 18-04-2013 43 3   Download

In recognition of the fact that the potential for release of particulate plutonium and transplutonium alpha-emitting elements from nuclear power generation facilities poses questions concerning spatial distribution of dose and the resultant biological effects, the NCRP initiated a new NCRP activity concerned with alpha-emitting particles in lungs. It was not intended that a complete review of the subject would be prepared.

31p camchuong_1 04-12-2012 72 3   Download

Các loại tia phóng xạ Tia bức xạ hạt nhân (hay còn gọi là tia phóng xạ) chủ yếu có 3 loại tia là: tia α, tia β và tia γ. Tia α có lực xuyên suốt nhỏ, chỉ cần nguồn tia bức xạ không vào trong cơ thể thì ảnh hưởng sẽ không lớn. Con đường chính để vào cơ thể là qua đường hô hấp và thức ăn và qua các vết thương. Tia β có độ xuyên suốt nằm ở giữa tia α và γ, dễ bị lớp tế bào biểu bì da hấp thụ, gây ra...

3p bibocumi13 05-11-2012 118 25   Download

Các nhà nghiên cứu ở Rutgers, Đại học bang New Jersey đã vừa vén lên những bí mật về đặc tính hoá học và vật lý của nguyên tố plutonium nổi tiếng. Trong một công trình đăng trên Nature, nhóm nghiên cứu đã báo cáo rằng, các electron hoá trị trong kim loại plutonium rắn luôn thăng giáng rất nhanh giữa các orbital khác nhau của nguyên tử. Điều đó trái với khẳng định của các lý thuyết trước đây cho rằng có một số xác định các electron hoá trị trên những orbital này. Khám phá của nhóm Rutgers...

3p nkt_bibo42 03-02-2012 63 4   Download

ạt nhân phóng xạ tồn tại lâu dài một cách dễ dàng có thể được nghiên cứu trong khu vực không bị ảnh hưởng bởi gần đây (ngày) tai nạn hạt nhân. Đây là một trong những lý do mà hạt nhân phóng xạ trong thời gian ngắn không được bao gồm trong chương này. Hai nguồn gốc của hạt nhân phóng xạ tồn tại lâu dài trong đất có thể được xem xét. Đầu tiên, hạt nhân phóng xạ nhân tạo là những yếu tố phóng xạ (plutonium đồng vị) và các sản phẩm phân hạch tồn tại lâu dài ( 137 cs, 90 SR). Trong cả...

40p giangsinh_trang 04-01-2012 61 3   Download