Chapter 9 Nuclear Radiation

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Presentation transcript:

Chapter 9 Nuclear Radiation 9.3 Radiation Measurement

Geiger Counter A Geiger counter detects beta and gamma radiation uses ions produced by radiation to create an electrical current

Units for Measuring Radiation Units for measuring radiation activity include Curie – measures activity as the number of atoms that decay in 1 second rad (radiation absorbed dose) – measures the radiation absorbed by the tissues of the body rem (radiation equivalent) – measures the biological damage caused by different types of radiation

Measuring Radiation Activity Often the measurement for an equivalent dose is in millirems (mrem). One rem is equal to 1000 mrem. The SI unit is the sievert (Sv). One sievert is equal to 100 rem.

Radiation Exposure Exposure to radiation occurs from naturally occurring radioisotopes medical and dental procedures air travel, radon, and smoking cigarettes cosmic rays

Radiation Sickness LD50 is the amount of radiation to the whole body that is the lethal dose for one-half the population varies for different life-forms, as Table 9.6 shows

Learning Check A typical intravenous dose of I-125 for a thyroid diagnostic test is 100 Ci. What is this dosage in megabecquerels (MBq) (3.7  1010 Bq = 1 Ci)? A. 3.7 MBq B. 3.7  106 MBq C. 2.7  102 MBq

Solution A typical intravenous dose of I-125 for a thyroid diagnostic test is 100 Ci. What is this dosage in megabecquerels (MBq) (3.7  1010 Bq = 1 Ci)? 100 Ci  1 Ci  3.7  1010 Bq  1 MBq x 1 x 106 Ci 1 Ci 1  106 Bq = 3.7 MBq The answer is A.