The statement "a substance is labeled as being radioactive" is incomplete. It doesn't tell us enough about the substance to understand what it means. Here's why:

* Radioactive substances are diverse: There are countless radioactive elements and isotopes, each with its own properties like:

* Type of radiation: Alpha, beta, gamma, neutron

* Half-life: How long it takes for half of the radioactive atoms to decay

* Intensity of radiation: How much radiation it emits

* Potential dangers: How harmful it is to living organisms

* "Radioactive" doesn't imply danger: Some radioactive substances are harmless (like the potassium in bananas) while others are highly dangerous (like plutonium).

To understand what a "radioactive substance" means, you need more information:

* What element or isotope is it? This determines its decay properties.

* What is its activity? This tells you how much radiation it emits per unit time.

* What is its context? Where is the substance located? How will it be used? This helps assess potential risks.

Example:

Saying "the substance is labeled as being radioactive Carbon-14 with an activity of 100 Bq" provides much more information than just "the substance is radioactive." It allows us to understand its properties and potentially assess its risks.