General | |
---|---|
Name, symbol | Caesium-137,137Cs |
Neutrons | 82 |
Protons | 55 |
Nuclide data | |
Natural abundance | 0 (trace) |
Half-life | 30.17 y ± 0.03 y[1] |
Parent isotopes | 137Xe (β−) |
Decay products | 137mBa 137Ba |
Isotope mass | 136.907 u |
Spin | 7⁄2+ |
Decay modes | |
Decay mode | Decay energy (MeV) |
β- (beta decay) | 0.5120[2] |
γ (gamma-rays) | 0.6617 |
Isotopes of caesium Complete table of nuclides |
Caesium-137 (137
55Cs
), or radiocaesium, is a radioactiveisotope of caesium which is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionableisotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from natural fission of uranium-238. It is among the most problematic of the short-to-medium-lifetime fission products because it easily moves and spreads in nature due to the high water solubility of caesium's most common chemical compounds, which are salts.
55Cs
), or radiocaesium, is a radioactiveisotope of caesium which is formed as one of the more common fission products by the nuclear fission of uranium-235 and other fissionableisotopes in nuclear reactors and nuclear weapons. Trace quantities also originate from natural fission of uranium-238. It is among the most problematic of the short-to-medium-lifetime fission products because it easily moves and spreads in nature due to the high water solubility of caesium's most common chemical compounds, which are salts.
Shaista Malik. Associate Professor. University of California, Irvine City Tower, Ste. 400 Mail Code: 4080 Irvine, CA 92697. Malik S, Wong ND, Franklin, SS, Kamath TV, L’Italien GJ, Pio JR, Williams GR. The Impact of the Metabolic Syndrome on Mortality from Coronary Heart Disease, Cardiovascular Disease, and All. Room type: SmartClassroom Seating: 97 fixed TAC (tablet-arm chairs) Standard features: Data projector (16:10 format 1280x800 WXGA image) Windows computer (software info)(DVD drive will play any region DVD).
- 5Incidents and accidents
Decay[edit]
137Cs Decay Scheme showing half-lives, daughter nuclides and types and proportion of radiation emitted
137Cs gamma spectrum. The characteristic 662 keV peak does not originate directly from 137Cs, but from the decay of the daughter nuclide 137Ba from metastable to its stable state
Caesium-137 has a half-life of about 30.17 years.[1]About 94.6% decays by beta emission to a metastablenuclear isomer of barium: barium-137m (137mBa, Ba-137m). The remainder directly populates the ground state of barium-137, which is stable. 137mBa has a half-life of about 153 seconds, and is responsible for all of the emissions of gamma rays in samples of caesium-137. Metastable barium decays to the ground state by emission of gamma rays having energy 0.6617 MeV. A total of 85.1% of 137Cs decays lead to gamma ray emission in this way. One gram of caesium-137 has an activity of 3.215 terabecquerel (TBq).[3]
The main photon peak of 137mBa is 662 keV.[4]
Uses[edit]
Caesium-137 has a number of practical uses. In small amounts, it is used to calibrate radiation-detection equipment.[5] In medicine, it is used in radiation therapy.[5] In industry, it is used in flow meters, thickness gauges,[5] moisture-density gauges (for density readings, with americium-241/beryllium providing the moisture reading),[6] and in gamma ray well logging devices.[6]
Caesium-137 is not widely used for industrial radiography because it is quite chemically reactive, and hence difficult to handle. The salts of caesium are also soluble in water, and this complicates the safe handling of caesium. Cobalt-60, 60
27Co
, is preferred for radiography, since it is chemically nonreactive metal and produces higher energy gamma-ray photons.
27Co
, is preferred for radiography, since it is chemically nonreactive metal and produces higher energy gamma-ray photons.
As an almost purely man-made isotope, caesium-137 has been used to date wine and detect counterfeits[7] and as a relative-dating material for assessing the age of sedimentation occurring after 1954.[8]
Caesium-137 is also used as a radioactive tracer in geologic research to measure soil erosion and deposition.[9]
Health risk of radioactive caesium[edit]
Caesium-137 reacts with water, producing a water-soluble compound (caesium hydroxide). The biological behavior of caesium is similar to that of potassium[10] and rubidium. After entering the body, caesium gets more or less uniformly distributed throughout the body, with the highest concentrations in soft tissue.[11]:114 The biological half-life of caesium is about 70 days.[12] A 1972 experiment showed that when dogs are subjected to a whole body burden of 3800 μCi/kg (140 MBq/kg, or approximately 44 μg/kg) of caesium-137 (and 950 to 1400 rads), they die within 33 days, while animals with half of that burden all survived for a year.[13]
Accidental ingestion of caesium-137 can be treated with Prussian blue, which binds to it chemically and reduces the biological half-life to 30 days.[14]
Radioactive caesium in the environment[edit]
The ten highest deposits of caesium-137 from U.S. nuclear testing at the Nevada Test Site. Test explosions 'Simon' and 'Harry' were both from Operation Upshot–Knothole in 1953, while the test explosions 'George' and 'How' were from Operation Tumbler–Snapper in 1952
Prop: Unit: | t½ (a) | Yield (%) | Q* (keV) | βγ* |
---|---|---|---|---|
155Eu | 4.76 | 0.0803 | 252 | βγ |
85Kr | 10.76 | 0.2180 | 687 | βγ |
113mCd | 14.1 | 0.0008 | 316 | β |
90Sr | 28.9 | 4.505 | 2826 | β |
137Cs | 30.23 | 6.337 | 1176 | βγ |
121mSn | 43.9 | 0.00005 | 390 | βγ |
151Sm | 88.8 | 0.5314 | 77 | β |
Caesium-137, along with other radioactive isotopes caesium-134, iodine-131, xenon-133, and strontium-90, were released into the environment during nearly all nuclear weapon tests and some nuclear accidents, most notably the Chernobyl disaster and the Fukushima Daiichi disaster.
As of today and for the next few hundred years, caesium-137 and strontium-90 continue to be the principal source of radiation in the zone of alienation around the Chernobyl nuclear power plant, and pose the greatest risk to health, owing to their approximately 30 year half-life and biological uptake. The mean contamination of caesium-137 in Germany following the Chernobyl disaster was 2000 to 4000 Bq/m².[citation needed] This corresponds to a contamination of 1 mg/km² of caesium-137, totaling about 500 grams deposited over all of Germany. In Scandinavia, some reindeer and sheep exceeded the Norwegian legal limit (3000 Bq/kg) 26 years after Chernobyl.[15] As of 2016, the Chernobyl caesium-137 has decayed by half, but could have been locally concentrated by much larger factors.
In April 2011, elevated levels of caesium-137 were also being found in the environment after the Fukushima Daiichi nuclear disasters in Japan. In July 2011, meat from 11 cows shipped to Tokyo from Fukushima Prefecture was found to have 1,530 to 3,200 becquerels per kilogram of 137Cs, considerably exceeding the Japanese legal limit of 500 becquerels per kilogram at that time.[16] In March 2013, a fish caught near the plant had a record 740,000 becquerels per kilogram of radioactive caesium, above the 100 becquerels per kilogram government limit.[17] A 2013 paper in Scientific Reports found that for a forest site 50 km from the stricken plant, 137Cs concentrations were high in leaf litter, fungi and detritivores, but low in herbivores.[18] By the end of 2014, 'Fukushima-derived radiocesium had spread into the whole western North Pacific Ocean', transported by the North Pacific current from Japan to the Gulf of Alaska. It has been measured in the surface layer down to 200 meters and south of the current area down to 400 meters.[19]
Caesium-137 is reported to be the major health concern in Fukushima. A number of techniques are being considered that will be able to strip out 80% to 95% of the caesium from contaminated soil and other materials efficiently and without destroying the organic material in the soil. These include hydrothermal blasting. The caesium precipitated with ferric ferrocyanide (Prussian blue) would be the only waste requiring special burial sites.[20] The aim is to get annual exposure from the contaminated environment down to 1 mSv above background. The most contaminated area where radiation doses are greater than 50 mSv/year must remain off limits, but some areas that are currently less than 5 mSv/year may be decontaminated, allowing 22,000 residents to return.
Caesium-137 in the environment is substantially anthropogenic (human-made). Caesium-137 is produced from the nuclear fission of plutonium and uranium, and decays into barium-137.[21] Before the construction of the first artificial nuclear reactor in late 1942 (the Chicago Pile-1), caesium-137 had not occurred on Earth in significant amounts for about 1.7 billion years. By observing the characteristic gamma rays emitted by this isotope, one can determine whether the contents of a given sealed container were made before or after the first atomic bomb explosion (Trinity test, 16 July 1945), which spread some of it into the atmosphere, quickly distributing trace amounts of it around the globe. This procedure has been used by researchers to check the authenticity of certain rare wines, most notably the purported 'Jefferson bottles'.[22] Surface soils and sediments are also dated by measuring the activity of 137Cs.
Incidents and accidents[edit]
Caesium-137 gamma sources have been involved in several radiological accidents and incidents.
1987 Goiânia, Goiás, Brazil[edit]
In the Goiânia accident of 1987, an improperly disposed of radiation therapy system from an abandoned clinic in Goiânia, Brazil, was removed then cracked to be sold in junkyards, and the glowing caesium salt sold to curious, unadvised buyers. This led to four confirmed deaths and several serious injuries from radiation contamination.[23][24] Caesium gamma-ray sources that have been encased in metallic housings can be mixed in with scrap metal on its way to smelters, resulting in production of steel contaminated with radioactivity.[25]
1989 Kramatorsk, Donetsk, Ukraine[edit]
The Kramatorsk radiological accident happened in 1989 when a small capsule containing highly radioactive caesium-137 was found inside the concrete wall of an apartment building in Kramatorsk, Ukrainian SSR. It is believed that the capsule, originally a part of a measurement device, was lost in the late 1970s and ended up mixed with gravel used to construct the building in 1980. Over 9 years, two families had lived in the apartment. By the time the capsule was discovered, 6 residents of the building had died from leukemia and 17 more had received varying doses of radiation.
1997, Georgia[edit]
In 1997, several Georgian soldiers suffered radiation poisoning and burns. They were eventually traced back to training sources abandoned, forgotten, and unlabeled after the dissolution of the Soviet Union. One was a caesium-137 pellet in a pocket of a shared jacket which put out about 130,000 times the level of background radiation at 1 meter distance.[26]
1998, Los Barrios, Cádiz, Spain[edit]
In the Acerinox accident of 1998, the Spanish recycling company Acerinox accidentally melted down a mass of radioactive caesium-137 that came from a gamma-ray generator.[27]
2009 Tongchuan, Shaanxi, China[edit]
In 2009, a Chinese cement company (in Tongchuan, Shaanxi Province) was demolishing an old, unused cement plant and did not follow standards for handling radioactive materials. This caused some caesium-137 from a measuring instrument to be included with eight truckloads of scrap metal on its way to a steel mill, where the radioactive caesium was melted down into the steel.[28]
March 2015, University of Tromsø, Norway[edit]
In March 2015, the Norwegian University of Tromsø lost 8 radioactive samples including samples of caesium-137, Am-241 and strontium-90. The samples were moved out of a secure location to be used for education. When the samples were supposed to be returned the university was unable to find them. As of 4 November 2015 the samples are still missing.[29][30]
March 2016 Helsinki, Uusimaa, Finland[edit]
On 3 and 4 March 2016, unusually high levels of caesium-137 were detected in the air in Helsinki, Finland. According to STUK, the country's nuclear regulator, measurements showed 4,000 μBq/m³ — about 1,000 times the usual level. An investigation by the agency traced the source to a building from which STUK and a radioactive waste treatment company operate.[31][32]
May 2019 Seattle, Washington, US[edit]
Thirteen people were exposed to caesium-137 in May 2019 at the Research and Training building in the Harborview Medical Center complex.[33]
See also[edit]
References[edit]
- ^ abNational Institute of Standards and Technology (6 September 2009). 'Radionuclide Half-Life Measurements'. Retrieved 7 November 2011.
- ^The Lund/LBNL Nuclear Data Search. 'Nuclide Table'. Archived from the original on 22 May 2015. Retrieved 14 March 2009.
- ^Bunting, R. L. (1975). 'Nuclear Data Sheets for A=137'. Nuclear Data Sheets 15. 335.
- ^Delacroix, D.; Guerre, J. P.; Leblanc, P.; Hickman, C. (2002). Radionuclide and Radiation Protection Handbook. Nuclear Technology Publishing. ISBN978-1870965873.
- ^ abc'CDC Radiation Emergencies | Radioisotope Brief: Cesium-137 (Cs-137)'. CDC. Retrieved 5 November 2013.
- ^ ab'Cesium | Radiation Protection | US EPA'. EPA. 3 June 2012. Archived from the original on 6 September 2015. Retrieved 4 March 2015.
- ^'How Atomic Particles Helped Solve A Wine Fraud Mystery'. NPR. 3 June 2014. Retrieved 4 March 2015.
- ^Williams, H. F. L. (1995). 'Assessing the impact of weir construction on recent sedimentation using cesium-137'. Environmental Geology. 26 (3): 166–171. Bibcode:1995EnGeo..26..166W. doi:10.1007/BF00768738. ISSN0943-0105.
- ^Loughran, Robert (1 June 1989). 'The measurement of soil erosion'. Progress in Physical Geography. 221 (2): 216–233. doi:10.1177/030913338901300203.
- ^Avery, Simon V. (1995). 'Caesium accumulation by microorganisms: uptake mechanisms, cation competition, compartmentalization and toxicity'. Journal of Industrial Microbiology. 14 (2): 76–84. doi:10.1007/BF01569888. ISSN0169-4146. PMID7766213.
- ^Delacroix, D.; Guerre, J. P.; Leblanc, P.; Hickman, C. (2002). Radionuclide and Radiation Protection Data Handbook 2002 (2nd ed.). Nuclear Technology Publishing. ISBN978-1-870965-87-3.
- ^R. Nave. 'Biological Half-life'. Hyperphysics.
- ^H.C. Redman; et al. (1972). 'Toxicity of 137-CsCl in the Beagle. Early Biological Effects'. Radiation Research. 50 (3): 629–648. Bibcode:1972RadR...50..629R. doi:10.2307/3573559. JSTOR3573559. PMID5030090.
- ^'CDC Radiation Emergencies | Facts About Prussian Blue'. CDC. Archived from the original on 20 October 2013. Retrieved 5 November 2013.
- ^Sandelson, Michael; Smith, Lyndsey (21 May 2012). 'Higher radiation in Jotunheimen than first believed'. The Foreigner. Retrieved 21 May 2012.
- ^'High levels of caesium in Fukushima beef'. Independent Online. 9 July 2011.
- ^'Fish near Fukushima reportedly contains high Cesium level'. Huffington Post. 17 March 2013.
- ^Murakami, Masashi; Ohte, Nobuhito; Suzuki, Takahiro; Ishii, Nobuyoshi; Igarashi, Yoshiaki; Tanoi, Keitaro (2014). 'Biological proliferation of cesium-137 through the detrital food chain in a forest ecosystem in Japan'. Scientific Reports. 4: 3599. Bibcode:2014NatSR...4E3599M. doi:10.1038/srep03599. ISSN2045-2322. PMC3884222. PMID24398571.
- ^Kumamoto, Yuichiro; et al. (2017). 'Radiation and analytical chemistry – Five years since the Fukushima Daiichi nuclear power plant accident'. Special Articles. Bunseki Kagaku (in Japanese and English). 66 (3): 137–148. doi:10.2116/bunsekikagaku.66.137.
- ^Normile, Dennis (1 March 2013). 'Cooling a hot zone'. Science. 339 (6123): 1028–1029. Bibcode:2013Sci...339.1028N. doi:10.1126/science.339.6123.1028. PMID23449572.
- ^Takeshi Okumura (21 October 2003). 'The material flow of radioactive cesium-137 in the U.S. 2000'(PDF). epa.gov/. US Environmental Protection Agency.
- ^'Christie's is counterfeit crusader's biggest target yet'. News Analysis. Collecting News | Collecting. Wine Spectator. Retrieved 5 November 2013.
- ^The Radiological Accident in Goiânia. IAEA. 1988.
- ^'Vítima do césio-137 lembra depressão e preconceito após acidente'. BBC Brasil. 26 April 2011.
- ^'Radioactive Scrap Metal'. NuclearPolicy.com. Nuclear Free Local Authorities. October 2000. Archived from the original on 21 March 2007.
- ^Lluma, Diego (May–June 2000). 'Former Soviet Union: What the Russians left behind'. Bulletin of the Atomic Scientists. 56 (3): 14–17. doi:10.2968/056003005.
- ^J.M. LaForge (1999). 'Radioactive Caesium Spill Cooks Europe'. Earth Island Journal. 14 (1). Archived from the original on 5 September 2008. Retrieved 28 March 2009.
- ^'Chinese 'find' radioactive ball'. BBC News. 27 March 2009.
- ^'UiT har mistet radioaktivt stoff – kan ha blitt kastet'. iTromsø. 4 November 2015.
- ^'Stort metallskap sporløst forsvunnet. Inneholder radioaktive stoffer'. Dagbladet. 4 November 2015.
- ^'Cesium 137 now traced back to the property's garage and parts of its basement premises - Tiedote-en - STUK'. www.stuk.fi. Retrieved 10 March 2016.
- ^Hannele Aaltonen. 'Cesium -137 contamination at STUK's premises in March 2016'(PDF). IAEA. Retrieved 13 October 2018.
- ^'13 exposed to radioactivity'. 3 May 2019.
Bibliography[edit]
- Olsen, Rolf A. (1994). '4.2. The Transfer of Radiocaesium from Soil to Plants and Fungi in Seminatural Ecosystems'. Nordic Radioecology - the Transfer of Radionuclides through Nordic Ecosystems to Man. Studies in Environmental Science. 62. pp. 265–286. doi:10.1016/S0166-1116(08)71715-1. ISBN9780444816177.
External links[edit]
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Caesium-137&oldid=915786396'
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1 CS 134: Elements of Cryptography and Computer + Network Security Winter 2015 sconce.ics.uci.edu/134-w15/ 1 CS 134 Background DBH 1500 Discussions section as needed (must register!) Senior-level undergraduate course Some overlap with CS 203 / NetSYS 240 (graduate) Offered since 2002 Last time Winter
2 Why (not) take this course? Not required for any track or concentration listed as an option in two specializations Difficult course material There ll be some weird math Tough grading Lectures often not available ahead of time There is no second chance if you mess up There is no drop after second week No Pass / No-pass option 3 Contact Information Instructor: Gene Tsudik gene.tsudik *AT* uci.edu Office: DBH 3228 (office hours only) ICS1 458E otherwise (for urgent matters only) Office Hours: Mondays, 11-noon More if needed, e.g., before finals or if out of town on Monday Otherwise, by appointment: contact by to set up TA: Tyler Kaczmarek PhD student, research in security & privacy tkaczmar *AT* uci.edu Office Hours: Wednesdays, ICS1 468 More if needed 4 2
3 Prerequisites Ideally, at least 2 of: Operating systems (CS 143A) Distributed systems (CS 131) Computer networks (CS 132) AND: Design/Analysis of Algorithms (CS 161) 5 Class Info Lecture format lecture slides (not always posted before class) 2-3 guest lectures 19 lectures total + midterm Course website: sconce.ics.uci.edu/134-w15/ check it regularly news, assignments, grades and lecture notes (in PDF) will all be posted there Read your 6 3
4 Course Textbooks/Readings Sort of REQUIRED: Network Security: Private Communication in a Public World, 2 nd edition Charlie Kaufman, Radia Perlman, Mike Speciner Prentice Hall 2002 ISBN: OPTIONAL: Cryptography : Theory and Practice, 3 rd edition Douglas R. Stinson CRC Press 2005 ISBN: Also: Cryptography and Network Security, 4 th edition William Stallings Prentice Hall 2006 ISBN: Course Grading Midterm (25%) Final (25%) 3 Homeworks (15% each) 5% for attendance / participation / enthusiasm BTW: I may or may not grade on a curve I will not hesitate giving C-s and worse 8 4
5 Student Expectations Keep up with material complete relevant readings before class browse lecture slides Slides will be on-line the same day, after class Attend lectures No excuses for not reading your ! Exams and homework: No collaboration of any sort Violators will be prosecuted An F in the course is guaranteed 9 Drop Policy Drop anytime during first 2 weeks Deadline January 16 Thereafter, no drop Incompletes to be avoided at all costs But, I have to graduate this quarter J 10 5
6 and remember: This is not a course for wimps You don t have to be here This course is not required I am not flexible 11 However: You might have fun I will certainly make mistakes point them out! I want your feedback Please ask lots of questions 12 6
7 Complaints about: Course content: to me Course grading: to me TA: to me Instructor, i.e., me: ICS Associate Dean of Student Affairs or Computer Science Department Chair 13 Today Administrative stuff Course organization Course topics Gentle introduction 14 7
8 Course Topics tentative and unsorted Security attacks/services Conventional cryptography Public Key cryptography Key Management Digital Signatures Secure Hash Functions Authentication + Identification Certification/Revocation Wireless/Mobile Net security DDOS attacks and trace-back IP security Firewalls SSL/TLS Kerberos, X.509 Access Control (RBAC) E-cash, secure e-commerce Mobile code security WSN security RFID Trojans/Worms/Viruses Intrusion Detection 15 Focus of the class Recognize security attacks/threats Learn basic defense mechanisms (cryptographic and otherwise) Appreciate how much remains to be learned after this course BTW: You certainly won t become an expert You might be (I hope) interested to study the subject further 16 8
9 Bird s eye view This course Network Security CRYPTO Computer Security 17 Outline The players Terminology Attacks, services and mechanisms Security attacks Security services Methods of Defense A model for network Security 18 9
10 Computer Security: The cast of Characters Attacker or Adversary Your computer 19 Network Security: the cast of characters communication channel EVE 20 10
11 Terminology (crypto) Cryptology, Cryptography, Cryptanalysis Cipher, Cryptosystem Encryption/Decryption, Encipher/Decipher Privacy/Confidentiality, Authentication, Identification Integrity Non-repudiation Freshness, Timeliness, Causality Intruder, Adversary, Interloper, Attacker Anonymity, Unlinkability/Untraceability 21 Terminology (security) Access Control & Authorization Accountability Intrusion Detection Physical Security Tamper-resistance Certification & Revocation 22 11
12 Attacks, Services and Mechanisms Security Attack: Any action that aims to compromise the security of information Security Mechanism: A measure designed to detect, prevent, or recover from, a security attack Security Service: something that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms Example: Security Attack: Eavesdropping (Interception) Security Mechanism: Encryption Security Service: Confidentiality 23 Some Classes of Security Attacks 24 12
13 Security Attacks Interruption: attack on availability Interception: attack on confidentiality Modification: attack on integrity Fabrication: attack on authenticity 25 Main Security Goals Authenticity Confidentiality Integrity Availability 26 13
14 Security Threats threat vs attack? By Injection By Deletion 27 Example Security Services Confidentiality: to assure information privacy Authentication: to assert who created or sent data Integrity: to show that data has not been altered Access control: to prevent misuse of resources Availability: to offer permanence, non-erasure Denial of Service Attacks e.g., against a name server Viruses that delete files 28 14
15 EVE 29 Some Methods of Defense Cryptography à confidentiality, authentication, identification, integrity, etc. Software Controls (e.g., in databases, operating systems) à protect users from each other Hardware Controls (e.g., smartcards, badges) à authenticate holders (users) Policies (e.g., frequent password changes, separations of duty) à prevent insider attacks Physical Controls (doors, guards, etc.) à control access 30 15
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