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Table 725. Slow Neutron Produced Radioactivities of Long Half-Life

Table 725. Slow Neutron Produced Radioactivities of Long Half-Life

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668

T A B L E 725.-SLOW



N E U T R O N PRODUCED R A D I O A C T I V I T I E S O F LONG

H A LF-L I F E (conc I uded)



Half-life



43 d

2.33 d

2.8 hr

48 d

53.9 min

105 d

2.8 d

60 d

9.3 hr

72 mln

25 min

8 d

5.27 d

3.1 hr

2.3 yr

11.7 d

85 min

40 hr

30 d

33 hr

19.3 hr

11.0 d

1.7 hr

47 hr

25 min

9.2 hr

7 Yr

18 h r

3.9 hr

75 d

2.5 hr

27.2 hr

9.4 d

7.5 hr

127 d

33 d

4.1 d

2.1 hr

3.7 hr

6.6 d

46d

120 d

73 d

24.1 hr

90 hr

18 hr

15 d

32 hr

70 d

19 hr

3.3 d

18 hr

31 min

2.7 d

51.5 d

3.5 yr

3.32 yr

5.0 d

138 d

23.5 min

25 d

23.5 min

2.3 d



SMITHSONIAN PHYSICAL TABLES



Max energy

&particles

emitted

Mev



1.7

1.13

1.7

I.T.

.85

.080

1.94

2.37

.70

1.8

2.02

.687

.35

2.4

.66

K capture

2.27

2.12

.6

1.35

2.14

.90



1.5

.78

1.9

1.88

.9

.95



....



.88

1.2

1.6

.33

1.5

.98

K capture

SO

1.2

1.15

.47

.46

.53

.43

1.33

1.05

2.05

.I42

1.2

.67

2.2



...



.7

1.8

.96

.21

.87

.68

1.17



... .



1.6

23

1.20

1.18



Max energy

y-rays

emitted

Mev



.5

.55



....



.I9

2.32

,085

.57

2.06

none

.8

,428

.37

.085

.7

1.40

1.2

.163

2.3

.2



.5



1.9

.58



....



.61

.3

,725

1.2

.38



....



1.15

.8



....



none

.81



.83(?)

.4

.35



....



none

.2

.47

1.22

none

.69

none

1.43

.I29

1.58



.a7



1.4



....

....



.411

.3

none

none

none



Thermal neutron

cross section

in barns



.14

1.1

1.4

61.

56.

1.1

6.8

2.5

.78

.13

6.8

from Telal decay

.2

.016

26.

24.

.5

9.

.95

.31

11.

1.5

2.4

280.

6.

1530.

1000.

1.1

11.

22.

2700.

67.



....



7.

118.

18,000.

50.



5.



30.

3200.

10.

20.6

2.1

37.2

101.

75.

3.4

3.9

740.

130.

4.5

1.1

3.9

96.

2.4

7.5

.00045



.015



from Bizlodecay

none

.30

from T€?' decay

.076

.27

from Ug decay



Percent

abundance

of parent

nucleus



28.

28.

7.3

4.5

95.77

1.1

57.

44.

18.7

31.8

100.

26.9

100.

100.

.09

71.7

99.9

88.5

11.1

100.

16.5

6.8

26.6

22.5

49.1

52.2

24.8

100.

100.

27.3

100.

27.1

14.9

100.



.I4

31.8

12.7

97.5

2.5

35.1

100.

30.7

29.2

38.2

61.8

26.4

41.0

38.5

61.5

25.4

25.4

7.2



100.



29.6

29.2

52.3

100.

100.

99.



T A B L E 726.-ARTIFICIAL



669



DISINTEGRATION



When various materials are bombarded with the high-speed particles produced by one of the devices given in Table.718, disintegrations, or the building up of elements higher in the atomic

table, result. Some examples of these reactions are given in the table.

P a r t 1.-Some



values of the energy of artificial disintegration for different isotopes and

for different reactions



- 2.320 Mev

.764



Neutron bombardment

- 9.57 Mev



- 2 8 Mev

.60

-15.6

- 2.31

1.73

- 4.10

.626

-11.43

- 9.97



2.6

6.69



- 2.9



- .so

- 1.63

- 7.43

-18.68

- 3.94



4.785

1.98

2.79

.22

.20



- 6.66



Proton bombardment

,558

8.70



5.53 Mev

4.021

- 1.645

17.21

17.28

559

6.49

- 1.84

2.125 Mev



- 5.2



1.146

8.57

- 2.762

15.96



'I4



3.00

4.92

1.92

7.56

2.96

8.113

3.84

2.455



Deuteron bombardment

Li*(d,a) He'

Lie(d,n) Bee

Lin(d,p)Li7

LP(d,n) Be7

Li'(d,a)He'

Li7(d,p) Lie

LP(d,a)He"

B'"(d,a) Bes,Bes a

B lo( d,p ) B 11,B" a

B"'(d,n)C''



Bes(a,a')Besfn

Bes(a,a')Bee

Bee(a,a')HeB

a

'Bee(a,a')%a n

LiO(a,p)Bea



8.03 Mev

13.78



22.23 Mev

3.54

5.012

3.34

22.29

- .193

14.3

17.81

9.24

6.53



- 1.63

- 1.63



Mev



- 2.4

++ - 1.58

2.12



5.99 Mev

13.50

8.57

5.1

- 4.36

6.16

7.62

3.07



.4



-



7:09

4.53

4.52

2.726

.279

5.10



a-ray bombardment

- 2.78 Mev



LiT(a,n)B'o,B'O

Blo( a,d) C'2

B'O(a,p)C'S,C''

B'o(a,n) N18

%e~(a,n)CIZ,CIZ



1.44

4.14

1.18

5.75



Bes(a,a')BeO.

B"(a,n) N14

B''(a,p) C"

C'2(a,n) 0 1 6



- 1.63 Mev

.28

.88



- 8.4



PnHornyak, W. F., and Lauritsen, T., Rev. Mod. Phys., vol. 20, p. 191, 1948; Phys. Rev., vol. 78,



p. 372, 1950.



P a r t 2.-Photo-nuclear

2.20f .05 Mev

1.63f .3

9.0 + .5

18.7 i l . 0

10.65k .2

16.2 f .3

il.5 fl.0

14.0 f l . 0

14.0 f .4

16.8 f .4

12.35f .2

14.8 f .4

13.2 f .2



reactions, threshold' values

15.9 f .4 Mev

13.8 f .2

10.15f .20

10.9 +- .2

10.2 f .2

11.8Of .20

9.20f .20

10.7 f .20

10.2 f .20

12.48f .15

7.20f .40

13.28f .I5

7.10k .30



228



6.442

6.51k

8.5Of

9.252

9.3 2

9.40-C

7.402

7.7 +8.OOf

6.25f

7.38f

6.85f

7.45k



. I 5 Mc!V

.15

.I5

.2

.2

.10

.20

.2



.I5

.20

.15

.20

.2



ma McElhinney, J., Hanson, A. 0..Becker, R. A,, Duffield, R. B., and Diven, B. C., Phys. Rev., vol. 75,



p. 542, 1949.



SMlTHSONlAN PHYSICAL TABLES



670

O F PRODUCING E L E M E N T S BEYOND URANIUM ppo



T A B L E 727.-METHODS



The heavier elements, Np, Pu, Am, Cm, Bk, and Cf may be produced by artificial transformation of U, followed by radioactive breakdown. A few examples follow :



ozu= +



O d



-+



For quantity production :

84PUZW o d + "4PU"O + y



+



+

,,,,Cine'' +

WPU"O



prPurn



+ ?He'



011'



3 WPU"'



S~PU'''

+u2Amar1

+ pj



or



+ + on1+



+y



o~t'



For quantity production :

05Am2'1 on'+

llsAm"2 y

u,Am212* +,,Cm"'



+

+

+p

SjAm'" + z H e ' j , K B ~+

* ' ~ + on'

d m * ' 2 + 2He' + ,,Cf"'+ "n' +

G . T. Seahorg, private communication.

100-year isomers.

Sixteen-hour



+



T A B L E 728.-PlLE



YIELDS OF SOME ISOTOPES*



Calculated for 10 liters of material exposed to 10" neutrons cm-' sec-'

Cross section

in units of



Radioactive

isotope



H3

Be"



Ca'5

Fe5'

ZIP

As'"

BrH2

Rb"

Sr"

Ag"'

IIPm

Taloz

Biz10



10-2' cmy

Density

times relative

of

material

isotope

abundance

g/cmS



10-7

,0086

1.7

.4

.23

.066

.012

.oo1

.26

4.6

1.12

.52

.0041

1.1

2.74

20.6

.015



1

1.85

1.6

.97

2.2

.86

1.54

4.86

7.14

5.7

3.12

1.53

2.6

10.5

7.3

16.6

9.8



Half-life

in hours



Atomic

weight of

material



1.1~105 9

2.4X1010 9

4x10'

30

14.8

23

343

31

12.4

39

3650

40

1110

56

6000

65

26.8

75

34

80

469

85

1770

88

5400

108

1150

115

2800

181

120

209



Revised by J. L. Rhodes. For reference, see footnote 226, p. 667.



SMITHSONIAN PHYSICAL TABLES



Mean

free path

cm



7 x 10'

570

12

60

60

680

2220

7000

65

2.86

22.8

106

8000

.41

5.7

.48

1420



Yields

mc/hr



10-7

7 x lo-*

2x10-s

1100

45

120

.12

.1

4.5

1300

1300

20

.I



200

150

680

6



67 1

T A B L E 7 2 9 . P O M P A R A T l V E PROPERTIES O F ORDINARY A N D

HEAVY WATER*



H20



Hz0



Property



Specific gravity at 25°C relative to ordinary water

at 25°C ......................................

1.0000

Temperature of maximum density. ...............

4.0"C

Dielectric constant .............................

81.5

Surface tension ................................

72.75 dynes/cm

Viscosity at 10°C.. .............................

13.10 millipoises

Melting point ..................................

.OOO"c

Boiling point (76 cmHg pressure). ............... 100.OO"C

Heat of fusion.. ................................

1436 cal/mole

Heat of vaporization at 25°C.. .................. 10484 cal/mole

Refractive index at 20°C for N a D line.. ..........

1.33300



1.1079

11.6"C

80.7

67.8

16.85

3.802"C

101.42"C

1510

10743

1.32828



* For reference, see footnote 224, p. 665.



T A B L E 730.-THE

Wavelengths,

cm



7500x104)



M E C H A N I C A L E F F E C T S OF R A D I A T I O N 230



Nature of

radiation



Visible radiation



3750~10-~

25ox



lo-*



X-rays



5x10-0

Soft y-rays

10-9



4x10-"



y-rays of RaB



5><10-11 Hardest y-rays

4.5x10-"

?

2X10-12

1.3x lo-"



zm Nat.



Highly penetrating

?



Res. Council Bull. 80; 1931.



SMITHSONIAN PHYSICAL TABLES



Effect on

atom



Disturbs outermost

electrons

Disturb inner

electrons



Temperature,

O K



7700

115,000



......

Building of H e atom

out of H

Disintegrates nuclei

Annihilation or creation

of proton and accompanying electron



Stellar

atmosphere

Stellar

interiors

Central

regions of

dense stars



Strip off all or nearly

all electrons

Disturb nuclear

arrangements



Where

found



720,000,000

5 8 x 10'

64x10'



15x 10'0

22x10"



?



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