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+# Module 3.1 - Radiation Terminology and Units
+>[!note] Radiation Activity Units
+>Activity is measured in disintegrations per unit time. 
+> - Historical Unit: The Curie
+> 	- 1 Curie = 3.7 x 10^10 disintegrations per second 
+> 		= 2.22 x 10^12 disintegrations per minute
+> - SI Unit: The Becquerel
+> 	-  1 Bq = 1 disintegration per second
+> 	
+
+1. Ionization is what causes all observable effects of radiation.
+	1. Breaks chemical bonds, disturbs chemical processes
+2. The number of ionization events a single particle of radiation can cause is dependent on energy
+	1. Number of ionization DENSITY is determined by the linear energy transfer, in units of energy per unit length
+		1. Alpha SUPER high
+		2. Beta mid
+		3. Gamma low
+	2. But different rays can only penetrate certain materials
+		1. Ionization density is inversely proportional to penetration
+
+# Module 3.2 - Radiation Damage in Biological Systems
+# Module 3.3 - Radiation Protection Standards
+# Module 3.4 - Estimating Radiation Dose Rates
+# Module 3.5 - Radiation Shielding
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