This document provides information on different types of radioactivity counters. It discusses the Geiger-Müller counter, which detects ionizing radiation using a Geiger-Müller tube. It operates by amplifying the ionization caused by radiation in a gas. The document also covers ionization chambers, which measure the number of ion pairs created in a gas by radiation. Finally, it discusses scintillation counters, which use a scintillator to generate light pulses from radiation, which are then converted to electrical signals.
Scintillation counter - instrumentation Principle, working, advantages and disadvantages and applications on various fields.
Reference : principles of biochemistry by wilson and walker.
An isotope is one of two or more atoms having the same atomic number but different mass numbers.
Unstable isotopes are called Radioisotopes.
uses of radioisotopes are many which are discussed in this slide.
Scintillation counter - instrumentation Principle, working, advantages and disadvantages and applications on various fields.
Reference : principles of biochemistry by wilson and walker.
An isotope is one of two or more atoms having the same atomic number but different mass numbers.
Unstable isotopes are called Radioisotopes.
uses of radioisotopes are many which are discussed in this slide.
Raman Spectroscopy - Principle, Criteria, Instrumentation and ApplicationsPrabha Nagarajan
Basic principle of Raman scattering- Difference between Rayleigh and Raman Scattering- Major criteria for Raman active in compounds,-Stroke's lines and Anti-stoke lines- Difference and between IR and Raman spectroscopy- Wide applications of Raman spectroscopy.
CHECKOUT THIS NEW WEB BROWSER :
https://www.entireweb.com/?a=618b79ed612f3
gm counter .working principle of gm counter, construction, advantage and disadvantage of gm counter.
Scintillation counter, its history, solid and liquid scintillation, scintillation cocktail, photomultiplier tube, advantage, and disadvantage.
Pharmaceutical Inorganic chemistry UNIT-V Radiopharmaceutical.pptx
Isotopes Types of decay
Alpha rays, which could barely penetrate a piece of paper
Beta rays, which could penetrate 3 mm of aluminium
Gamma rays, which could penetrate several centimetres of lead
Units of Radioactivity:
Measurement of Radioactivity
The measurement of nuclear radiation and detection is an important aspect in the identification of type of radiations (, , ) and to assay the radionuclide emitting the radiation, suitable detectors are required. The radiations are identified on the basis of their properties.
e.g. Ionization effect is measured in Ionization Chamber, Proportional Counter and Geiger Muller Counter.
The scintillation effect of radiation is measured using scintillation detector and the photographic effect is measured by Autoradiography.
Gas Filled Detectors:
Ionization Chamber:
Proportional Counters:
Geiger-Muller Counter
Properties of α, β, γ radiations
Half –life of Radioelement
Sodium Iodide (I131)
Handling and Storage of Radioactive Material:
Storage of Radioactive Substances –
Precautions For Handling Radioactive Substances
Labelling of Radioactive Substances
Pharmaceutical Application Of Radioactive Substances
Raman Spectroscopy - Principle, Criteria, Instrumentation and ApplicationsPrabha Nagarajan
Basic principle of Raman scattering- Difference between Rayleigh and Raman Scattering- Major criteria for Raman active in compounds,-Stroke's lines and Anti-stoke lines- Difference and between IR and Raman spectroscopy- Wide applications of Raman spectroscopy.
CHECKOUT THIS NEW WEB BROWSER :
https://www.entireweb.com/?a=618b79ed612f3
gm counter .working principle of gm counter, construction, advantage and disadvantage of gm counter.
Scintillation counter, its history, solid and liquid scintillation, scintillation cocktail, photomultiplier tube, advantage, and disadvantage.
Pharmaceutical Inorganic chemistry UNIT-V Radiopharmaceutical.pptx
Isotopes Types of decay
Alpha rays, which could barely penetrate a piece of paper
Beta rays, which could penetrate 3 mm of aluminium
Gamma rays, which could penetrate several centimetres of lead
Units of Radioactivity:
Measurement of Radioactivity
The measurement of nuclear radiation and detection is an important aspect in the identification of type of radiations (, , ) and to assay the radionuclide emitting the radiation, suitable detectors are required. The radiations are identified on the basis of their properties.
e.g. Ionization effect is measured in Ionization Chamber, Proportional Counter and Geiger Muller Counter.
The scintillation effect of radiation is measured using scintillation detector and the photographic effect is measured by Autoradiography.
Gas Filled Detectors:
Ionization Chamber:
Proportional Counters:
Geiger-Muller Counter
Properties of α, β, γ radiations
Half –life of Radioelement
Sodium Iodide (I131)
Handling and Storage of Radioactive Material:
Storage of Radioactive Substances –
Precautions For Handling Radioactive Substances
Labelling of Radioactive Substances
Pharmaceutical Application Of Radioactive Substances
Complete detail about the Radiopharmaceutical, General Introduction, Radioactive substance, Radioactive rays like alpha, beta and gamma rays. All the Measurement method to determine the radioactivity of any element and widely used instrument Geiger Muller Counter. And some Radiopharmaceutical product used in many diagnosis , treatment such like sodium iodide solution & capsule, Rose Bengal I 131 and Application of Radiopharmaceuticals.
Different Types of Radioactive Counters or detectors used in analyzing low or high penetrating power radiation or particles are explained briefly with their advantages and disadvantages.
Medha Thakur (M.Sc Chemistry)
Contamination, Preservation & Spoilage of Vegetables.pptxNizam Ashraf
This slide gives an overview on the topic Contamination, Preservation & Spoilage of Vegetables.
Contamination
It has been estimated that 1/4th of all product harvested is spoiled before contamination.
Spoilage of fresh vegetables usually occurs during storage and transport and while waiting to be processed.
Vegetables may be dried, fresh, frozen, fermented, pasteurized or canned.
During transportation to market or the processing plant, mechanical damage may increase susceptibility to decay and growth of micro organisms may take place.
Recirculated or reused water for washing of vegetables likely to add organisms and the washing process may moisten surfaces enough to permit growth of organisms.
Sorting spoiled vegetables or trimming spoiled parts removes micro organisms, but additional handling may result in mechanical damage and therefore greater susceptibility to decay.
Spraying with water or packing with chipped ice is done. This spraying gives a fresh appearance to the vegetables and delays decomposition but also adds organisms, e.g. psychrotrophs, from water or ice and gives a moist surface to encourage their growth on longer storage.
Sweating of products during handling increases the number of micro organisms in them.
Processes such as trimming, mechanical abrasion or peeling, cutting, pitting or coring, and various methods of disintegration may add contaminants from the equipment involved.
Examples of possible source of contaminants of foods with micro organisms are trays, bins, tanks, pipes, flumes, tables, conveyer belts and aprons, filters, blanchers, presses, screens, and filters.
Inclusion of decayed part of fruits increases the number of micro organisms in fruit juices.
Added ingredients such as sugars and starch may add spoilage organisms, specially spores of thermophilic bacteria
Spoilage
The deterioration of raw vegetables result from physical factors, action of their own enzymes, microbial action, or combination of these agencies.
Mechanical damage resulting from action of animals, birds, or insects or from bursting, wounding, cutting, freezing, desiccation, or other mishandling may predisposed towards increased enzymatic action or the entrance or growth of micro organisms.
Contact with spoiling vegetables may bring about transfer of organisms, causing spoilage and increasing the wastage. If oxygen is available, the plant cells will respire as long as they are alive, and hydrolytic enzymes can continue their action after death of their cells.
Disease of vegetables and fruits may result from the growth of an organisms that obtains its food from the host and usually damages it or from adverse environmental conditions that cause abnormalities in functions and structures of the vegetables or fruits.
AGENTS OF SPOILAGE
Black mold rot, caused by Aspergillus Niger.
Black rot, often caused by species of Alternaria but sometimes of Ceratostomella, Physalospora and other genera.
Pink mold rot, caused by pink spored Trichothecium roseum.
A biogeochemical cycle is the circulation of an element in the Earth system. It involves various reservoirs that store the element, fluxes between reservoirs as well as the physical, chemical and biological parameters that regulate the fluxes. The oceans play a key role in the biogeochemical cycling of elements on our planet. As primary productivity is strictly limited to the photic zone and decay of organic matter is pursued in the deeper water masses of the oceanic system, the distribution of many elements exhibits a strong vertical gradient. A biogeochemical cycle refers to the cycling and transport of a chemical element or compound, usually in multiple forms and physical states, through the biotic (living) and abiotic (nonliving) components of the earth system. Some of the most commonly examined biogeochemical cycles include carbon, nitrogen, oxygen, iron and phosphorous.
The marine nitrogen cycle is one of the most complicated biogeochemical cycles in the ocean. Nitrogen is a biologically limiting element and changes in its form, or concentration, can cause changes in the cycling of other elements, such as carbon and phosphorus. Marine nitrogen cycle is perhaps the most complex and therefore the most fascinating among all biogeochemical cycles in the sea. Nitrogen exists in more chemical forms than most other elements, with a myriad of chemical transformations. All these transformations are undertaken by marine organisms as part of their metabolism, either to obtain nitrogen to synthesize structural components, or to gain energy for growth. Nitrogen gas (N2) from the atmosphere dissolves into seawater at the ocean surface. Nitrogen gas is the most abundant form of nitrogen in the ocean, but is not useful to most living things. Dissolved nitrogen gas is taken up by just a few types microbes, which convert the nitrogen into a much more useable form, known as ammonium (NH4+). This process, known as “nitrogen fixation,” is vitally important. Without it, very little nitrogen would available for thousands of other organisms that live near the ocean surface.
Ammonium is the form of nitrogen that is most easily consumed by microorganisms. For this reason, ammonium is consumed almost as fast as it is produced, a process called “assimilation.” The result is that the nitrogen becomes incorporated into the cells of living organisms. Some marine microbes consume nitrite and nitrate, another form of assimilation. When microbes (and other organisms) die, they decompose, releasing ammonium and tiny particles containing particulate organic nitrogen (PON), as well as dissolved organic nitrogen (DON) into the surrounding seawater. Some microbes convert ammonium to nitrite (NO2-) and then nitrite to nitrate (NO3-). This two-step process is called “nitrification.” The result of this process is that nitrate is released into the ocean. A host of organisms consume particulate organic nitrogen and dissolved organic nitrogen, converting some of the nitrogen back to a
This PPT dicusses about the Stirred Tank Bioreactor and its features mainly used in Fermentation process.
Useful for students doing their Bachelor's in Life Science
This PPT discusses about the main types of Nucleic Acid Based Techniques - Blotting (Southern, Northen, Western)
Do Leave a comment if you liked the presentation, so that i can improve more and share more!
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Professional air quality monitoring systems provide immediate, on-site data for analysis, compliance, and decision-making.
Monitor common gases, weather parameters, particulates.
Richard's aventures in two entangled wonderlandsRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Nutraceutical market, scope and growth: Herbal drug technologyLokesh Patil
As consumer awareness of health and wellness rises, the nutraceutical market—which includes goods like functional meals, drinks, and dietary supplements that provide health advantages beyond basic nutrition—is growing significantly. As healthcare expenses rise, the population ages, and people want natural and preventative health solutions more and more, this industry is increasing quickly. Further driving market expansion are product formulation innovations and the use of cutting-edge technology for customized nutrition. With its worldwide reach, the nutraceutical industry is expected to keep growing and provide significant chances for research and investment in a number of categories, including vitamins, minerals, probiotics, and herbal supplements.
Seminar of U.V. Spectroscopy by SAMIR PANDASAMIR PANDA
Spectroscopy is a branch of science dealing the study of interaction of electromagnetic radiation with matter.
Ultraviolet-visible spectroscopy refers to absorption spectroscopy or reflect spectroscopy in the UV-VIS spectral region.
Ultraviolet-visible spectroscopy is an analytical method that can measure the amount of light received by the analyte.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
A brief information about the SCOP protein database used in bioinformatics.
The Structural Classification of Proteins (SCOP) database is a comprehensive and authoritative resource for the structural and evolutionary relationships of proteins. It provides a detailed and curated classification of protein structures, grouping them into families, superfamilies, and folds based on their structural and sequence similarities.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
2. Radioactivity
• Radioactivity is a phenomenon that occurs naturally in a number of substances.
• Atoms of the substance spontaneously emit invisible but energetic radiations,
which can penetrate materials that are opaque to visible light.
• The effects of these radiations can be harmful to living cells but, when used in the
right way, they have a wide range of beneficial applications, particularly in
medicine.
• Radioactivity has been present in natural materials on the earth since its
formation.
• However, because its radiations cannot be detected by any of the body’s five
senses, the phenomenon was only discovered 100 years ago when radiation
detectors were developed.
3.
4. Radio-active detectors
• A wide range of radioactivity detectors are in use today. The main detector
is the Geiger–Mueller counter or G-M counter.
• A Geiger counter is an instrument made of glass or metal tube used for
detecting and measuring ionizing radiation.
• It has a thin window, usually made of mica at one end to enclose the gas.
• It detects ionizing radiation such as α-particles, β- particles, and gamma
rays using the ionization effect produced in a Geiger–Müller tube.
• In wide and prominent use as a hand-held radiation survey instrument, it is
perhaps one of the world's best-known radiation detection instruments.
1. Geiger–Mueller counter
5.
6. Principle of operation
• A Geiger counter consists of a Geiger–Müller tube (the sensing
element which detects the radiation) and the processing electronics,
which displays the result.
• The Geiger–Müller tube is filled with an inert gas such as helium,
neon, or argon at low pressure, to which a high voltage is applied.
• The tube briefly conducts electrical charge when a particle or photon
of incident radiation makes the gas conductive by ionization.
• The ionization is amplified within the tube by the Townsend discharge
effect to produce an easily measured detection pulse, which is fed to
the processing and display electronics.
7. • The electronics also generate a high voltage, typically 400–900 volts,
that has to be applied to the Geiger–Müller tube to enable its
operation.
• To stop the discharge in the Geiger–Müller tube a little halogen gas or
organic material (alcohol) is added to the gas mixture.
8. • The detected radiation can be readout as two: counts or radiation
dose.
• The counts display is the simplest and is the number of ionizing
events detected displayed either as a count rate, such as "counts per
minute" or "counts per second", or as a total number of counts over a
set time period. The counts readout is normally used when alpha or
beta particles are being detected.
• While the radiation dose rate is displayed in a unit such as the sievert
which is normally used for measuring gamma or X-ray dose rates.
• A Geiger–Müller tube can detect the presence of radiation, but not its
energy, which influences the radiation's ionizing effect.
9. Limitations
• There are two main limitations of the Geiger counter.
• Because the output pulse from a Geiger–Müller tube is always of the
same magnitude, the tube cannot differentiate between radiation
types.
• Secondly, the inability to measure high radiation rates due to the
"dead time" of the tube. This is an insensitive period after each
ionization of the gas during which any further incident radiation will
not result in a count, and the indicated rate is, therefore, lower than
actual.
10. Types and Application
• The GM counters can be generally categorized as "end-window",
windowless "thin-walled", "thick-walled“ and hybrids of this types.
• GM counters are mainly employed in the
1. Particle Detection.
2. Gamma and X-Ray Detection.
3. Neutron Detection – (Boron trifluoride or Helium-3)
4. Physical Design.
11. 2. Ionization Chamber
• The ionization chamber is the simplest of all gas-filled radiation
detectors.
• Widely used for the detection and measurement of certain types of
ionizing radiation such as X-rays, gamma rays, and beta particles.
• Ion chambers have a good uniform response to radiation over a wide
range of energies and are the preferred means of measuring high
levels of gamma radiation.
• They are widely used in the nuclear power industry,
research labs, radiography, radiobiology, and
environmental monitoring.
12. Principle
• An ionization chamber measures the charge from the number of ion pairs
created within a gas caused by incident radiation.
• It consists of a gas-filled chamber with two electrodes; known as anode and
cathode.
• A voltage potential is applied between the
electrodes to create an electric field.
• When gas between the electrodes is ionized
by incident ionizing radiation, ion-pairs are
created and the resultant positive ions and
dissociated electrons move to the electrodes
of the opposite polarity under the influence
of the electric field.
• This generates an ionization current which is
measured by an electrometer circuit.
13. Types and Applications
• The following chamber types are commonly used:
1. Free-air Chamber
2. Vented Chamber
3. Sealed low pressure Chamber
4. High pressure Chamber
5. Parallel-plate Chamber
• The following are the Applications of Ionization Chamber
1. In Nuclear industry
2. Smoke detectors
3. Medical radiation measurement
14. Counter
3. Scintillation Counter
• A scintillation counter is an instrument for detecting and measuring
ionizing radiation by using the excitation effect of incident radiation on a
scintillating material, and detecting the resultant light pulses.
• It consists of a scintillator which generates photons in response to incident
radiation, a sensitive photodetector (usually a photomultiplier tube (PMT),
a charge-coupled device (CCD) camera, or a photodiode), which converts
the light to an electrical signal and electronics to process this signal.
15. • Scintillation counters are widely used in radiation protection, assay of
radioactive materials as they can measure both the intensity and the
energy of incident radiation.
• When high energy atomic radiations are incident on a surface coated
with some fluorescent material, then flashes of light (scintillations)
are produced.
• The scintillations are detected with the help of a photomultiplier
tube, that gives rise to an equivalent electric pulse.
Principle
16. Scintillator
• The Scintillator is made from a single crystal that should have
following characteristics:
• Available in proper form
• High efficiency
• Transparent to light
• Suitable value of refractive index
• High resolution power
• Stable under experimental conditions
Popular types of crystals used as Scintillators are:
Cesium Iodide, Zn Sulphide, Xenon, Organic Phosphors for detection of
Gamma rays.
17. Photomultiplier Tube
• Around 10 dynodes are specifically designed and properly positioned,
for automatic focusing of electrons.
• Each dynode have a particular function:
1. Collection of photoelectrons from previous dynode
2. Emission of low energy electrons
18. Working
1. The radiations are allowed to enter the scintillators through a
window of pyrex glass.
2. When high energy radiations strike the crystal, short duration
scintillations are emitted.
3. The photoelectrons emitted from cathode are directed towards 1st
dynode that give rise to secondary emission of electrons.
4. The secondary electrons, emitted from the surface of 1st dynode,
get accelerated towards 2nd dynode.
5. The process repeats and electron get much more multiplied in
number. A high energy pulse is delivered to the counting device
through the anode.
6. The electric pulse is then delivered to the electronic counting
device, through a discriminator.
19. Applications
• Used in hand held radiation survey meters, personnel and
environmental monitoring for radioactive contamination
• Medical imaging
• Radiometric assay
• The ability to accommodate samples of any type, including liquids,
solids and gels.
• The ability to count separately different isotopes in the same sample,
which means dual labelling experiments can be carried out.
• Scintillation counters are highly automated