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Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

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In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Imaging Studies II: Positron Emission Tomography and Scintigraphy

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Positron Emission Tomography (PET) is a medical imaging technique that provides crucial insights into the body's physiological functions at a molecular level. It is an indispensable resource for diagnosing, staging, and monitoring various illnesses, notably cancer, neurological disorders, and cardiovascular conditions.
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Radioactivity and Nuclear Equations03:18

Radioactivity and Nuclear Equations

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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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Types of Radioactivity

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The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
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Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
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The international reference system for beta-particle emitting radionuclides: Validation through the pilot study

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The Bureau International des Poids et Mesures (BIPM) developed a new liquid scintillation counter for radioactive standard equivalence. This method shows agreement with existing systems, achieving high accuracy but requires attention to impurities.

Keywords:
ESIRInternational system of referenceLiquid scintillation countingRadionuclide metrologySIRStandardization

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Area of Science:

  • Nuclear Metrology
  • Radioactivity Standardization
  • Traceability of Measurements

Background:

  • The Bureau International des Poids et Mesures (BIPM) provides centralized services for assessing international equivalence of radioactive standards.
  • Existing methods, like ionization chambers, have been in use since 1976 for primary radioactivity calibrations.
  • There is a need to extend these services to new radionuclides using advanced measurement techniques.

Purpose of the Study:

  • To develop and validate a new transfer instrument for assessing international equivalence of radioactive standards.
  • To extend BIPM's services to new radionuclides using liquid scintillation counting.
  • To compare the performance of the new method against the established ionization chamber system.

Main Methods:

  • A liquid scintillation counter (LSC) utilizing the triple/double coincidence ratio (TDCR) method was studied and tested.
  • A pilot study, CCRI(II)-P1.Co-60, involved 13 participating laboratories with primary calibration capabilities.
  • The LSC results were validated against the BIPM's international reference system based on ionization chambers.

Main Results:

  • The TDCR method using LSC demonstrated agreement with the established ionization chamber system.
  • The pilot study achieved an accuracy suitable for purpose, below 5×10-4.
  • An issue was identified concerning the impact of low-energy electron-emitting impurities on LSC measurements.

Conclusions:

  • The liquid scintillation counter using the TDCR method is a viable approach for extending radioactivity standardization services.
  • The method provides results in agreement with primary standards and achieves high accuracy.
  • Further investigation is needed to address the influence of impurities on LSC measurements for accurate standardization.