TABLE 1. PHYSICAL CONSTANTS OF COMMONLY USED RADIONUCLIDES

Nuclide....................Half-life....................Decay Mode....................gamma energy....................# of photons/100 disintegrations

C-11........................20.4 min....................b+ emitter..............................511 keV......................................................200 %

C-14........................5730 yr......................b- emitter..............................----..................................................................----

Co-57....................270.9 d.........................EC ....................................... 122 keV.....................................................200 %

Cr-51 .......................28 d ...........................EC ..........................................320 kev.........................................................9

Cs-137 ...................30 yr .............................b- .........................................662 ...............................................................85

F-18 .......................1.83 hr ...........................b+ .........................................511 ............................................................200

Fe-52 .......................8.3 hr ...........................b+ .(56%) ........................165 ..............................................................100

EC (44%) .....................511 ...............................................................112

Fe-59 .......................45 d ..............................b- .......................................1,099 ..............................................................56

..1,292...............................................................43

Ga-67 .......................79.2 h .........................EC .........................................94 .................................................................40

...184 ................................................................24

...296 ................................................................22

Ge-68 .......................68 min .......................b+ .........................................511 .............................................................178

H-3 ............................12.3 yr .......................b- .........................................-- .....................................................................--

I-123 .......................13.3 h ...........................b+ .......................................159 ...............................................................83

I-125 .......................60 d .......................EC ..............................................35 ...................................................................7

27-32 (X-rays) .........................................140

I-131 .......................8.08 d .......................b- ..........................................364.5 ............................................................82

In-111 ......................67 h .......................EC .........................................173, 247 ....................................................89, 94

In-113m ................1.67 h .......................IT ..............................................393 ............................................................64

Kr-81m ....................13 s .......................IT ..............................................191 .............................................................67

Mo-99 ......................67 hr .......................b- .........................................181, 740 ....................................................6, 12

..........................................780 ...............................................................4

O-15 ........................2.05 min .......................b+ ....................................511 ...........................................................190

P-32 ..............................14.3 d .......................b- ......................................-- ...............................................................--

Rb-82 ............................75 sec .......................b+ ..................................511 ...........................................................190

Re-186 .........................3.8 d ..........................b-(92%) ......................137 ...............................................................9

EC (8%)

Sm-153 .......................1.9 d .......................b- .....................................70,103 ....................................................5, 28

Sr-89 ............................52 d .......................b- .........................................-- ..................................................................--

Tc-99m .......................6.02 h .......................IT .................................140.5 .............................................................90

Tl-201 .......................73 h .......................EC ...................................135, 167 ......................................................2, 8

71 Hg X-rays

Xe-127 .......................36.4 d .......................EC .......................172, 203, 375.........................................24,68, 16

Xe-133 .......................5.3 d .......................b- ......................................81 ...............................................................37