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PRESENTATION SKILLS

Teacher : Hoa Pham Ngoc Thai

Student : Dong Nguyen Manh

Contents

2

31 Overview of ionizing radiation

Biological Effects of Radiation

Overview of ionizing radiation

WILHELM CONRAD ROENTGEN

Mrs. Roentgen’s

hand

Biological Effects of Radiation

EARLY EFFECTS

(Prompt Effects)

After a high, single radiation exposure in a short period of

time

SKIN

EARLY EFFECTS(Lower doses or localized)

GONADS

BLOOD COUNT REDUCTION

CELLULAR CHROMOSOME DAMAGE

Some riskSome risk

ACUTE RADIATION SYNDROME

LATE EFFECTS

After an acute exposure or an extended chronic exposure

Take months to years to become evident

www.themegallery.com

Some risk at any dose

Some

risk

Cancer Including leukemia

Mental retardati

on cataracts

CANCER RISK ESTIMATES

ONE MILLION PEOPLE EXPOSED TO 1 RAD

50 to 150 deaths from radiation induced cancer occurring within 25 years

100,000 PEOPLE EXPOSED TO 100mrad/YEAR

19,000 would die from cancer without exposure

Increased cancer deaths estimated at about 550

RISK MODELLinear Non-threshold

Atomic Bomb ???

Hiroshima & Nagasaki• 300,000 total population

• 140,000 killed

• 100,000 survivors with

significant radiation doses

• Increased leukemia occurrence

• Increased mental retardation (8- 15 weeks gestation)

Conclusion

REMEMBER…

the radiation is only dangerous when we don't understand about it

Thank You for listening !