Radiation Overview Presented by Capt. Colbrunn (Tank) Xenia Twp Fire Dept
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Transcript of Radiation Overview Presented by Capt. Colbrunn (Tank) Xenia Twp Fire Dept
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Radiation Overview Presented by Capt. Colbrunn (Tank)
Xenia Twp Fire Dept
Used with permission from
Wright-Patterson AFB Radiation Safety office
-Unclassified -
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Ionizing radiation consists of electromagnetic or particulate radiations capable of interacting with the atom causing removal of one or more electrons such that the atom has a resulting net positive charge
Ionizing Radiation
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• Radioactivity - a property of some species of atoms to spontaneously emit radiation(s) usually by disintegration of the nuclei of the atoms
• Radiation - the energy or particles emitted when a radionuclide transforms or disintegrates (radiation is not the same as radioactivity)
• Radionuclide - a nuclide that emits radiation(s)
DEFINITIONS
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Ionizing
Non-ionizing
Ionizing Vs Non-ionizing
x-ray machine
microwave
radar
AM/FM
gamma ray
(Matching Game)
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• curie (Ci)– The activity of 1 gram of 226Ra
– 3.7 x 1010 disintegrations per second (dps)
• becquerel– one disintegration per second (dps)
• one dps is NOT synonymous with the number of particles emitted by the isotope in one second
Activity
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• The interval at which a radionuclide decays to one-half the original activity
• Each radionuclide has its own characteristic half-life
• Half-lives range from microseconds to billions of years
Half -life
Radionuclide Half-life 57Co 270 days241Am 433 years 63Ni 100 years226Ra 1600 years
109Cd 464 days
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• Alpha ()
• Beta minus ()
• Beta positive () (positron) and Electron Capture
• Gamma (associated with other types of decay)
Decay Methods
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Line of Stability
A Z N# of
stablenuclides
even even even 159
odd even odd 53
odd odd even 50
even odd odd 4
266
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• Roentgen (R)– the measure of the number of ion-pairs produced by
gamma radiation in a certain volume of air
Exposure
+ ++
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• RAD (Radiation Absorbed Dose)– an absorbed radiation dose of 100 ergs per gram
– energy deposited by any ionizing radiation in a unit mass of any absorber
• Gray (Gy)– 1 Gy = 100 rads
DOSE
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DOSE
• REM (RAD Equivalent Man)– the absorbed dose (RAD) multiplied by a quality factor to
equalize biological consequences
• Sievert (Sv)– 1 Sv = 100 rems
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Radiation Quality Factor x-ray 1
gamma 1
beta 1
alpha 20
neutron (unknown energy) 10
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• Exposure - the delivery of radiation to an individual that results in the receipt of a radiation dose
• Contamination - radioactive material distributed in an unwanted place or location
Exposure Vs Contamination
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No biological sensors of ionizing radiation
Must depend on instruments
Interaction with matter principles used
Detection is dependent on type of radiation
OFF
BATT
x10Kx1K
x100x10
RESET
AUDIO
ON
0
2040 60
80
100
COUNTS/MINGENERAL
ELECTRICGE
ALPHA SURVEY METER LEA75-1854 SER.NO.
|||||||| ||
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Dose Vs Dose Rate• Dose - generic term that means absorbed dose, dose
equivalent, effective dose equivalent or total effective dose equivalent (mrem)
• Dose Rate - the rate at which a dose is being delivered per a time interval (mrem per hour)
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Radiation Type In Air Typical Shielding Material Used
Alpha inches paper or aluminum foil
Beta feet aluminum or Lucite
Gamma hundreds lead or concrete
of feet
Why does alpha have a higher quality factor?
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• Dose Equivalent (HT) - the product of the absorbed dose in tissue, quality factor, and all other necessary modifying factors at the location of interest.
• Effective Dose Equivalent (HE) - the sum of the products of the dose equivalent to the organ or tissue (HT) and the weighting factors (WT) applicable to each of the body organs or tissues that are irradiated (HE = WT HT)
Internal Dose
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Organ or Tissue WT
Gonads 0.25
Breast 0.15
Red Bone Marrow 0.12
Lung 0.12
Thyroid 0.03
Bone Surfaces 0.03
Remainder 10.30
Whole Body 1.00
1 0.30 results from 0.06 for each of the “remainder” organs (excluding the skin and the lens of the eye) that receivethe highest dose.
ORGAN DOSE WEIGHTING FACTORS
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• Committed Dose Equivalent (HT,50) - the dose equivalent to organs or tissues of reference (T) that will be received from an intake of radioactive material by an individual during the 50-year period following the intake
• Committed Effective Dose Equivalent (HE,50) - the sum of the products of the weighting factors applicable to each of the body organs or tissues that are irradiated and the committed dose equivalent to these organs or tissues (HE,50 = WT HT,50)
Internal Dose
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• Total Effective Dose Equivalent (TEDE) - the sum of the deep-dose equivalent (for external exposures) and the committed effective dose equivalent (for internal exposures)
TEDE = Deep Dose + CEDE
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• Direct – ionization and excitation
» radiation + H2O H2O+ + e-
H+ + OH-
» radiation + H2O Ho + OHo (free radical)
– occurs anywhere in body
• Indirect – Radicals react with biological molecule and damage it
– Radicals combine
» OHo + OHo H2O2 (hydrogen peroxide)
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Cell Division
Normal
Parent
CellDivision
DaughterCells
IrradiatedCell
GrowthNo Division
IrradiatedCell
Mutant cells (death, altered DNA)
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Dose (REM)
Effect(Risk)
0 100 450 1000
Linear/Threshold
Confirmed Data
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Most to least radiosensitive
Immature male sex cells
White blood cells
Bone marrow cells
Epithelial cells of the intestine
Cells such as the skin covering external surfaces
Cells that line the closed cavities of the body (i.e., heart, blood vessels)
Bone cells
Nerve cells
Brain cells
Muscle cells
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Two types of exposure
• Acute - a single accidental exposure to a high dose during a short period of time
• Chronic - a long-term, low level exposure
Radiation Effects
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• Factors– Type of radiation
– Absorbed dose
– Dose distribution
– Age
• Stages– Initial (nausea, vomiting)
– Latent
– Manifest illness
– Recovery
Acute Exposures
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Dose Effect
1 rad to bone marrow20-50 rad (whole body)>90-150 rad (whole body)300 rad (skin)450 rads (whole body)600-900 rad, (local to eye)>1000 -4000 rads (whole body)10,000 rads (whole body)1000-6000 (localized)
risk of leukemiablood changesmild radiation sicknesserythemaLD 50/30cataractsdeath in 1 to 2 weeksdeath in hours to dayscancer treatments
Acute Exposure
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• Cancer– leukemia
– bone
– lung
– skin
– etc.
• Genetic
• Life shortening
Chronic Exposure (Delayed Effects)
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• Somatic - effects which occur to an individual being exposed during their lifetime
• Genetic - effects that are act on the offspring of the individual being exposed
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• Stochastic– effects that occur by chance
– occur among unexposed as well as among exposed
– in radiation, main effects are cancer and genetic effects
• Non-Stochastic– certain minimum dose must be exceeded for effect
– magnitude of effect increases with size of dose
– clear causal relationship between exposure and effect
Dose-Response Characteristics
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• The human population has always received radiation exposure from natural sources such as cosmic, dietary, and soil.
• Additional sources of exposure are medical exposures, occupations exposures and some industrial and consumer products.
RISKS
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Annual effective dose equivalent in the U.S. population Source Average Dose (mrem)
• Natural sources– Radon 200
– Other 100
• Occupational 0.9
• Nuclear fuel cycle 0.05
• Consumer products– Tobacco
– Other 5-13
• Misc. Environ Sources 0.006
• Medical– Diagnostic x-ray 39
– Nuclear medicine 14
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Food40K
pCi/kg
226Ra
pCi/kg
Banana 3520 1
Brazil nuts 5600 1000-7000
Carrot 3400 0.6-2
White potatoes 3400 1-2.5
Beer 390 ---
Red meat 3000 0.5
Lima bean raw 4640 2-5
Drinking water --- 0-0.17
Natural Radioactivity in Food
Ref: http://www.physics.isu.edu/radinf/natural.htm
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Cosmic 8%
Terrestrial 8%
Internal 11%
Radon 55%
Medical X-rays 11%
Nuclear Medicine 4%
Consumer Products 3%
Other <1% Occupational Nuclear Fuel Cycle Fall out Misc
Sources ofRadiation Exposure
Average Exposure 360 mrem/yr
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Source of Radiation (excludes indoor radon)
1. Cosmic Radiation: 40 mrem a sea level (Add 1 mrem for each 100 feet elevation)
2. House Construction: Wood: 35 mrem Concrete: 50 mrem Brick: 75 mrem 3. Water and Food a. U.S. average 25__ b. Heavy smoker (add 30 mrem) c. Drink beer (add 1 mrem for each 100 bottles) _____
4. Air a. Natural - U.S. average 5 b. Weapons testing 2 5. Transcontinental Flights: Add 4 mrem for each 5000 miles in flight
6. Radium Dial Wrist Watch: (add 2 mrem)
7. Television: U.S. average 2__ 8. Radioactivity in Human Body a. Dose to yourself (K-40) 20__ b. Sleep with spouse (add 0.3 mrem) c. Dose to yourself (C-14) 0.2
9. Medical and Dental Diagnosis a. U.S. average 55 mrem or b. For each chest, teeth, head neck and bone x-ray, add 20 mrem c. For each spinal column and kidney x-ray , add 200 mrem d. For each stomach, intestines and gall bladder x-ray, add 250 mrem
10. Live in the vicinity of large coal-fired power plant (add 0.1 mrem)
11. Live in the vicinity of large geothermal power plant (add 1 to 100 mrem)
12. Nuclear Power Plants: a. If you live (1) At boundary fence (fraction of year spent times 5 mrem)
(2) One mile away (fraction of year spent times 0.5 mrem)
(3) Five miles away (fraction of year spent times 0.05 mrem ______ b. General U.S. population: Add 0.01 mrem
Total mrem/year
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RISKS
• It is estimated that if 100,000 persons of all ages received a whole body dose of 10 rad of gamma radiation in a single brief exposure, about 800 extra cancer deaths would be expected to occur during their remaining lifetimes (BEIR V)
• It is estimated that if 100,000 persons of all ages received a continuous lifetime whole body dose of 100 mrad per year, about 550 extra deaths would be expected. (BEIR V)
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• To prevent the occurrence of clinically significant radiation-induced deterministic effects by adhering to dose limits that are below the apparent threshold levels; and
• To limit the risk of stochastic effects, cancer and genetic effects, to a reasonable level in relation to societal needs, values, benefits gained and economic factors
Objectives of Radiation Protection
NCRP No. 116
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• Time
• Distance
• Shielding
External Radiation Protection Measures
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• dose rate x exposure time = total dose
20 mRem/hr x 30 min = 10 mRem
• Reduce time reduces exposure
TIME
1000 mR/hr for 2 minutes = ________________
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• Radiation exposure decreases with increasing distance
• Decrease by inverse square law
• Double the distance decrease the exposure by 4
DISTANCE
0100200300400
1 2 3 4
400
1002544
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Paper Plastic Lead Concrete
a42 Alpha
Beta
Gamma and X-rays
Neutron
01
n10
Shielding
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• Fire, Explosion, Instrument Damage, etc.– Secure the area– Keep Unauthorized persons away– Alert people within the vicinity– Notify Department of Energy (DOE)
» Initiate appropriate actions» Make appropriate written report
• Loss or Theft– Immediate notification of DOE and Nuclear Regulatory Commission
» Immediate notification of Radioisotope Committee» Make written report
– Immediately begin search
Response Actions
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Susan, I see youhave grown a footsince the last time I saw you !