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Related Concept Videos

Nuclear Stability03:18

Nuclear Stability

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.
To hold positively charged protons together in the...
Types of Radioactivity03:23

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
¹³C NMR: ¹H–¹³C Decoupling01:04

¹³C NMR: ¹H–¹³C Decoupling

The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis. This...
Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

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Related Experiment Video

Updated: Jun 26, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
10:42

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

Published on: May 3, 2019

Decay correction of 95Nb.

Arvic Harms1, Lena Johansson, Desmond MacMahon

  • 1National Physical Laboratory, Hampton Road, Teddington TW11 0LW, UK. arvic.harms@npl.co.uk

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|January 20, 2009
PubMed
Summary
This summary is machine-generated.

Accurate dating of nuclear events using the Niobium-95/Zirconium-95 activity ratio is crucial. This study presents an improved method for decay correction, addressing poor proficiency test results and enhancing nuclear event dating accuracy.

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Area of Science:

  • Nuclear physics
  • Radiochemistry
  • Nuclear forensics

Background:

  • The Niobium-95/Zirconium-95 (95Nb/95Zr) activity ratio is a key indicator for dating nuclear events.
  • Previous proficiency tests revealed inaccuracies in 95Nb measurements, likely due to flawed decay corrections.
  • Reliable dating of nuclear events is essential for various applications, including security and environmental monitoring.

Purpose of the Study:

  • To develop an improved method for calculating the 95Nb/95Zr activity ratio.
  • To address the inaccuracies in decay corrections that affect nuclear event dating.
  • To enhance the reliability of nuclear event dating using radionuclide ratios.

Main Methods:

  • The study utilizes the integrated Bateman equation, a fundamental tool in nuclear physics for modeling radionuclide decay and ingrowth.
  • The method incorporates the complex decay schemes of parent radionuclides, specifically accounting for the multiple branching of 95Zr and 95mNb.
  • It also considers the ingrowth and decay of radionuclides during the measurement period and applies decay corrections to a precise reference time.

Main Results:

  • The presented integrated Bateman equation provides a more accurate calculation of the 95Nb/95Zr activity ratio.
  • The improved method directly addresses the sources of error identified in previous proficiency tests.
  • This leads to more precise and reliable determination of the date of nuclear events.

Conclusions:

  • The developed method offers a significant improvement for accurate nuclear event dating.
  • It provides a robust solution to the challenges posed by incorrect decay corrections in radionuclide analysis.
  • This advancement is vital for enhancing the capabilities of nuclear forensics and related scientific fields.