Name:______

B.6 EXTRAPRACTICE:NUCLEAR BALANCINGACT

Writea balancedequationforeachofthefollowing nuclear reactions. Examples:

Chlorine-36decaysbybeta emissionDubnium-262 decaysbyalpha emission

1. Krypton-87decaysbybeta emission.

2. Curium-240decaysbyalpha emission.

3. Uranium-232decaysbyalpha emission.

4. Silicon-32decaysbybeta emission.

5. Zinc-71decaysbybetaemission.

6. Americum-243 decaysbyalpha emission.

7. Cobalt-60decaysbybeta emission.

8. Phosphorous-32decaysbybeta emission.

9. Gadolinium-150 decaysbyalpha emission.

10.Lead-210 decaysbyemittingboth abetaandanalphaparticle.

B.7CONTENT READING GUIDE: RADON

Directionsforthis ContentReadingGuide:In thefirst column, write "A”or"D”indicatingyour agreementordisagreementwith each statement beforereadingSectionB.7.Asyou read Section B.7,completethe secondcolumnbyentering "A”or"D” based on whetherthe

statementagrees with informationfrom thereading. Inthespace beloweach statement,cite informationfrom thereading that supportsorrefutes youroriginal ideas.

Me / Text / Statement
1. Radonhasalwaysbeenin Earth’satmosphere.
2. Radonis more ofaproblemin olderhomesthannewerones.
3. There is nowaytofixa radonproblem in yourhome.
4. Theradioactive decayproductsof radonaremore dangerous
thanradonitself.
5. TheEPA estimatesthat less than1%of thehomesin theUnited
Stateshave excessiveradonlevels.
6. About80%ofU.S.lungcancerdeathsannuallyarecausedby inhalingradon.

C.3 EXTRAPRACTICE:APPLICATIONSOFHALF-LIVES

Completethefollowingquestions.

1. Thehalf-lifeofsulfur-38is2.87hours.

a.After8.61 hours, whatpercent oftheoriginal radiation is left?

Percent original radiation

b.If3.125%of theoriginal radiation is beingemitted, howmanyhalf-lives have passed?

Halflives passed

2. Calcium-47hasa half-life of4.5days. Graphthedecayofasamplefor7half-lives,with time

(days)onthexaxisandamountoforiginal radiation(%) ontheyaxis.

Time (Days)

a. Howmuch radiationfrom calcium-47remains after two weeks?

Calcium-47 radiation remaining

b. When will thecalcium radiation be10%of theoriginal value?

Timeat which calciumradiation is 10%oforiginal value

c. Howmuchofthesamplewill have decayedafter7 half-lives?

Amount decayedsampleafter7 half-lives