Iridium-192 is one radioisotope used in brachytherapy in which a radioactive source is placed inside a patient's body to treat cancer. brachytherapy allows the use of a higher than normal dose to be placed near the tumor while lowering the risk of damage to healthy tissue. iridium-192 is often used in the head or breast. if a sample of iridium-192 is initially 3.25g and 1.21g remains after 105 days, estimate the half-life of the radioisotope.

The half-life of the radioisotope : 73.68 days

The core reaction is a reaction that causes changes in the core structure.

In the core reaction, the number of atomic numbers and mass numbers of the reactants is the same as the atomic number and mass number of the product

Radioactivity is the process of unstable isotopes to stable isotopes by decay, by emitting certain particles, among others

General formulas used in decay:

T = duration of decay

t 1/2 = half-life

No = the number of initial radioactive atoms

Nt = the number of radioactive atoms left after decaying during T time

A sample of iridium-192 is initially 3.25 g and 1.21 g remains after 105 days, estimate the half-life of the radioisotope

So :

No = 3.25 g

Nt = 1.21 g

T = 105 days

We input this to equation to find half life (

exponential decay

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nuclear decay reaction

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Plutonium − 239

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Keywords: the half-life, decay reaction,  iridium-192

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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