chemistry

Isotopes of dysprosium

Isotopes of dysprosium is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Isotopes of dysprosium rather than just read about it. In short: Naturally occurring dysprosium (66Dy) is composed of 7 stable isotopes, 156Dy, 158Dy, 160Dy, 161Dy, 162Dy, 163Dy and 164Dy, with 164Dy being the most abundant (28.26% natural abundance). Twenty-nine radioisotopes have been characterized, with the most stable being 154Dy with a half-life of 1.4 million years, 159Dy with a half-life of 144.4 days, and 166Dy with a half-life of 81.6 hours.

Key takeaways

Isotopes of dysprosium belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Isotopes of dysprosium to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Isotopes of dysprosium from memory before moving on to harder problems.

Reference excerpt

Naturally occurring dysprosium (66Dy) is composed of 7 stable isotopes, 156Dy, 158Dy, 160Dy, 161Dy, 162Dy, 163Dy and 164Dy, with 164Dy being the most abundant (28.26% natural abundance). Twenty-nine radioisotopes have been characterized, with the most stable being 154Dy with a half-life of 1.4 million years, 159Dy with a half-life of 144.4 days, and 166Dy with a half-life of 81.6 hours. All of the remaining radioactive isotopes have half-lives that are less than 10 hours, and the majority of these have half-lives that are less than 30 seconds. This element also has 12 meta states, with the most stable being 165mDy (half-life 1.257 minutes), 147mDy (half-life 55.7 seconds) and 145mDy (half-life 13.6 seconds). The primary decay mode before the most abundant stable isotope, 164Dy, is electron capture to isotopes of terbium, and after beta decay to those of holmium. Dysprosium is the heaviest element to have isotopes that are theoretically stable (163, 164), rather than only ones that are observationally stable and predicted to be radioactive. 164Dy has a surprisingly large thermal neutron absorption and the product isotope 165Dy has found medical use (see below).

List of isotopes

Dysprosium-165 The radioactive isotope 165Dy, with a half-life of 2.332 hours, has radiopharmaceutical uses in radiation synovectomy of the knee. It had been previously performed with colloidal-sized particles containing longer-lived isotopes such as 198Au and 90Y. The major problem with the usage of those isotopes was radiation leakage out of the knee. 165Dy, with its shorter half-life and thus shorter period of potential radiation leakage, is more suitable for the procedure.

See also Daughter products other than dysprosium

Isotopes of holmium Isotopes of terbium Isotopes of gadolinium

References

Worked examples

Example 1 — a first encounter with Isotopes of dysprosium

Start with the simplest possible case. Write down what Isotopes of dysprosium claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Isotopes of dysprosium before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Isotopes of dysprosium ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Isotopes of dysprosium

In research: Isotopes of dysprosium appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Isotopes of dysprosium in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Isotopes of dysprosium is common in secondary-school and first-year university syllabi. It links to neighbouring topics Dysprosium, Isotopes of dysprosium, Lists of isotopes by element, so understanding it makes those chapters shorter.
In everyday life: Look for Isotopes of dysprosium outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Isotopes of dysprosium in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Isotopes of dysprosium means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Isotopes of dysprosium out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Isotopes of dysprosium in simple terms?

Why does Isotopes of dysprosium matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Isotopes of dysprosium?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Isotopes of dysprosium.