This is Episode 29: Radiation Protection - Fundamental Principles and Basic Units.In our previous episodes, we’ve explored the multifaceted ways radiation interacts with biological systems, from the molecular dance of DNA damage and repair to the observable effects on cells, tissues, and even the developing embryo. Today, we're transitioning to a critical practical aspect: how we conceptualize and manage the risks associated with radiation. We'll lay the groundwork by clearly differentiating between the two major categories of radiation effects – stochastic and deterministic – as understanding this difference is fundamental to why we have specific protection strategies. We’ll then introduce the basic units used to quantify radiation: radioactivity, exposure, and absorbed dose. And finally, we'll outline the three universally accepted ethical principles that govern all radiation protection practices: justification, optimization (famously known as ALARA), and dose limitation. This episode sets the stage for understanding the more detailed dose limits we'll cover next time.

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