Prospera®
Pd-103 MODEL MED3633
There are two types of radioactive material (called
isotopes) commonly used in seed implantation - Palladium-103
and Iodine-125. Palladium-103 is the isotope used
in Prospera devices. Palladium and Iodine seeds are
nearly identical in appearance. Both are about the
size of an uncooked grain of rice, are implanted the
same way, and emit low energy radiation. The primary
difference is the rate at which they give off their
energy.
Prospera® Pd-103
(Model MED3633) Physical Characteristics
Prospera Pd-103 brachytherapy sources have a half-life
of 16.99 days1 and decay by electron capture
with the emission of characteristic x-rays at 20 -
23 keV and Auger electrons. The electrons are absorbed
by the titanium wall of the capsule. Decay factors
for activity calculations are provided in the "Palladium
Decay Chart," which is included in the product
information data sheet packaged with each Prospera
shipment.
Each source consists of a welded titanium capsule
containing the radioactive source absorbed onto four
resin beads. Tow inactive gold beads serve as locations
markers.
Prospera®
Pd-103 Model MED3633 Source Strengths and Seven-Day
Decay Chart
All orders are 100% calibrated and certified to a
midpoint activity.
| |
Monday |
Tuesday |
Wednesday |
Thursday |
Friday |
Saturday |
Sunday |
MCi
U |
0.99
(1.28) |
0.95
(1.23) |
0.91
(1.18) |
0.88
(1.13) |
0.84
(1.09) |
0.81
(1.04) |
0.78
(1.00) |
MCi
U |
1.09
(1.41) |
1.05
(1.35) |
1.00
(1.30) |
0.96
(1.25) |
0.93
(1.20) |
0.89
(1.15) |
0.85
(1.10) |
mCi
U |
1.20
(1.55) |
1.15
(1.49) |
1.11
(1.43) |
1.06
(1.37) |
1.02
(1.32) |
0.98
(1.26) |
0.94
(1.21) |
mCi
U |
1.32
(1.71) |
1.27
(1.64) |
1.22
(1.57) |
1.17
(1.51) |
1.12
(1.45) |
1.08
(1.39) |
1.03
(1.34) |
mCi
U |
1.45
(1.88) |
1.39
(1.80) |
1.34
(1.73) |
1.28
(1.66) |
1.23
(1.59) |
1.18
(1.53) |
1.14
(1.47) |
mCi
U |
1.60
(2.06) |
1.53
(1.98) |
1.47
(1.90) |
1.41
(1.83) |
1.36
(1.75) |
1.30
(1.68) |
1.25
(1.62) |
mCi
U |
1.75
(2.27) |
1.68
(2.18) |
1.62
(2.09) |
1.55
(2.01) |
1.49
(1.93) |
1.43
(1.85) |
1.37
(1.78) |
mCi
U |
1.93
(2.50) |
1.85
(2.40) |
1.78
(2.30) |
1.71
(2.21) |
1.64
(2.12) |
1.57
(2.03) |
1.51
(1.95) |
mCi
U |
2.12
(2.74) |
2.04
(2.63) |
1.96
(2.53) |
1.88
(2.43) |
1.80
(2.33) |
1.73
(2.24) |
1.66
(2.15) |
|
- The source
strengths are provided in Apparent Activity (mCi)
and
air-kerma strength (U or µGym2/hr.).
- Air-kerma strengths are based on NIST’s 2000
corrected measurement
for 99 WAFAC standard.
- An equivalence of 1 mCi (app) = 1.293 U has been
used to convert
air-kerma
strength to Apparent Activity.2
- Sources in the same order may deviate from the midpoint
by up to 4.8%.
Prospera®
Pd-103 (Model MED3633) Technical Data Sheet
Prospera is a registered trademark of North American
Scientific.
References:
1. As per Ionizing Radiation Division Group at NIST.
2. R. Nath, L.L. Anderson, G. Luxton, K.A. Weaver,
J.F. Williamson, and A.S. Meigooni. Dosimetry of interstitial
brachytherapy sources: Recommendations of the AAPM
Radiation Therapy/Committee Task Group No. 43. Medical
Physics, 22 pp. 209-234.
