Technetium information, including Technical Data, Safety Data and its high purity properties, research, applications and other useful facts are discussed below. Scientific facts such as the atomic structure, ionization energy, abundance on Earth, conductivity and thermal properties are included.
 Technetium is a Block D, Group 7, Period 5 element. The number of electrons in each of Technetium's shells is 2, 8, 18, 13, 2 and its electronic configuration is [Kr] 4d5 5s2. In its elemental form Technetium's CAS number is 7440-26-8. The Technetium atom has a radius of 135.2.pm and
it's Van der Waals radius is 200.pm.
Technetium was discovered by Carlo Perrier and Emilio Segre in 1937. Technetium was the first element to be made artificially. This is indicated by its name which originates from the greek word "technetos" meaning artificial.
 technétium |
Technetium |
 tecneto |
 Tecnécio |
 tecnecio |
Teknetium |
Technetium Abundance. The following table shows the abundance of Technetium and each of its naturally occurring isotopes on Earth along with the atomic mass for each isotope.
| Isotope |
Atomic Mass |
% Abundance on Earth |
| Tc-98 |
97.907216 |
- |
| Tc-99 |
98.906255 |
- |
Technetium Safety Data. The safety data for Technetium metal, nanoparticles and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the left margin. Technetium compounds have no biological role.
Ionization Energy. The ionization energy for Technetium (the least required energy to release a single electron from the atom in it's ground state in the gas phase) is stated in the following table:
| 1st Ionization Energy |
702.42 kJ mol-1 |
| 2nd Ionization Energy |
702.42 kJ mol-1 |
| 3rd Ionization Energy |
2850.20 kJ mol-1 |
Conductivity. As to Technetium's electrical and thermal conductivity, the electrical conductivity measured in terms of electrical resistivity @ 20 ºC is 16.9 µOcm and its electronegativities (or its ability to draw electrons relative to other elements) is 2.1. The thermal conductivity of Technetium is 50.6 W m-1 K-1.
Thermal Properties of Technetium. The melting point and boiling point for Technetium are stated below. The following chart sets forth the heat of fusion, heat of vaporization and heat of atomization.
| Heat of Fusion |
23.81 kJ mol-1 |
| Heat of Vaporization |
585.22 kJ mol-1 |
| Heat of Atomization |
678 kJ mol-1 |
Recent Research & Development for Technetium
In vitro and in vivo targeted delivery of photosensitizers to the tumor cells for enhanced photodynamic effects.
Gupta S, Dwarakanath BS, Chaudhury NK, Mishra AK, Muralidhar K, Jain V.
J Cancer Res Ther. 2011 Jul;7(3):314-24.
PMID:
22044814
[PubMed - in process]
In Vivo SPECT Reporter Gene Imaging of Regulatory T Cells.
Sharif-Paghaleh E, Sunassee K, Tavaré R, Ratnasothy K, Koers A, Ali N, Alhabbab R, Blower PJ, Lechler RI, Smyth LA, Mullen GE, Lombardi G.
PLoS One. 2011;6(10):e25857. Epub 2011 Oct 17.
PMID:
22043296
[PubMed - in process]
Acetazolamide-challenged perfusion magnetic resonance imaging for assessment of cerebrovascular reserve capacity in patients with symptomatic middle cerebral artery stenosis: comparison with technetium-99m-hexamethylpropyleneamine oxime single-photon emission computed tomography.
Kim HJ, Kim TW, Ryu SY, Yang PS, Kwon MJ, Kim JC, Lee YS, Lee HJ, Yang JH, Kim JK, Chung YA, Oh EY, Lee SB.
Clin Imaging. 2011 Nov;35(6):413-20.
PMID:
22040783
[PubMed - in process]
Correction of liver displacement due to irregular respiration for SPECT images obtained using a multiple short-time acquisition with breath-holding technique.
Ueda Y, Kudomi S, Koike M, Oishi Y, Iwanaga H, Ueda K.
Radiol Phys Technol. 2011 Oct 27. [Epub ahead of print]
PMID:
22038313
[PubMed - as supplied by publisher]
Long-distance transport of pertechnetate in the moonflower (Ipomoea alba).
Clarke SJ, Rogiers SY, Currie GM.
J Environ Radioact. 2012 Jan;103(1):54-8. Epub 2011 Sep 25.
PMID:
22036159
[PubMed - in process]
Decorporation and Therapeutic Efficacy of Liposomal-DTPA Against Thorium Induced Toxicity in the Wistar Rat.
Kumar A, Sharma P, Ali M, Pandey BN, Mishra KP.
Int J Radiat Biol. 2011 Oct 31. [Epub ahead of print]
PMID:
22035501
[PubMed - as supplied by publisher]
Systemic lupus erythematosus complicated with protein-losing enteropathy: A case report and review of the published works.
Awazawa R, Yamamoto YI, Mine Y, Nakamura I, Kishimoto K, Kinjyo F, Hagiwara K, Fujita J, Uezato H, Takahashi K.
J Dermatol. 2011 Oct 31. doi: 10.1111/j.1346-8138.2011.01404.x. [Epub ahead of print]
PMID:
22035257
[PubMed - as supplied by publisher]
Pretreatment With Citrulline Improves Gut Barrier After Intestinal Obstruction in Mice.
Batista MA, Nicoli JR, Dos Santos Martins F, Nogueira Machado JA, Esteves Arantes RM, Pacífico Quirino IE, Davisson Correia MI, Cardoso VN.
JPEN J Parenter Enteral Nutr. 2011 Oct 21. [Epub ahead of print]
PMID:
22020808
[PubMed - as supplied by publisher]
Nephromegaly is a Significant Risk Factor for Renal Scarring in Children With First Febrile Urinary Tract Infections.
Cheng CH, Hang JF, Tsau YK, Lin TY.
J Urol. 2011 Oct 21. [Epub ahead of print]
PMID:
22019042
[PubMed - as supplied by publisher]
Renal scintigraphy predicts global cardiovascular risk in hypertensive subjects with normal serum creatinine levels.
Mazza A, Rampin L, Montemurro D, Schiavon L, Zuin M, Grassetto G, Chondrogiannis S, Al-Nahhas A, Ramazzina E, Rubello D.
Blood Press. 2011 Oct 24. [Epub ahead of print]
PMID:
22017389
[PubMed - as supplied by publisher]
Blood Flow to the Extensor Carpi Radialis Brevis Muscle Following Adrenaline Infusion in Patients With Lateral Epicondylitis.
Vedung T, Werner M, Ljung BO, Jorfeldt L, Henriksson J.
J Hand Surg Am. 2011 Oct 18. [Epub ahead of print]
PMID:
22015074
[PubMed - as supplied by publisher]
Improved transnasal transport and brain uptake of tizanidine HCl-loaded thiolated chitosan nanoparticles for alleviation of pain.
Patel D, Naik S, Misra A.
J Pharm Sci. 2011 Oct 17. doi: 10.1002/jps.22780. [Epub ahead of print]
PMID:
22006260
[PubMed - as supplied by publisher]
Single-Photon-Emission Computed Tomography (SPECT) with Technetium-99m Sestamibi in the Diagnosis of Small Breast Cancer and Axillary Lymph Node Involvement.
de Cesare A, Vincentis Giuseppe D, Stefano G, Giacomo C, Enrico F, Marco B, Crocetti A, Sterpetti AV.
World J Surg. 2011 Oct 15. [Epub ahead of print]
PMID:
22002494
[PubMed - as supplied by publisher]
Efficacy of US-guided Percutaneous Cholecystocholangiography for the Early Exclusion and Type Determination of Biliary Atresia.
Lee SY, Kim GC, Choe BH, Ryeom HK, Jang YJ, Kim HJ, Park JY, Cho SM.
Radiology. 2011 Oct 13. [Epub ahead of print]
PMID:
21998045
[PubMed - as supplied by publisher]
Effects of Previous Surgery on the Detection of Sentinel Nodes in Women With Vulvar Cancer.
Ennik TA, Allen DG, Bekkers RL, Hyde SE, Grant PT.
Int J Gynecol Cancer. 2011 Oct 8. [Epub ahead of print]
PMID:
21997173
[PubMed - as supplied by publisher]
Comparisons of Technetium-99m Diethylenetriaminepentaacetic Acid Plasma Clearance and Renal Dynamic Imaging With Inulin Clearance.
Chen LI, Kuo MC, Hwang SJ, Chen YW, Wu KD, Chen HC.
Am J Kidney Dis. 2011 Oct 12. [Epub ahead of print] No abstract available.
PMID:
21995969
[PubMed - as supplied by publisher]
Time-Course Analysis of Brain Perfusion Single Photon Emission Computed Tomography Using a Three-Dimensional Stereotactic Region-of-Interest Template in Patients with Moyamoya Disease.
Marushima A, Tsurushima H, Suzuki K, Nakai Y, Nemoto H, Matsumura A.
World Neurosurg. 2011 Sep;76(3-4):304-10.
PMID:
21986429
[PubMed - in process]
Photoreduction of (99)Tc Pertechnetate by Nanometer-Sized Metal Oxides: New Strategies for Formation and Sequestration of Low-Valent Technetium.
Burton-Pye BP, Radivojevic I, McGregor D, Mbomekalle IM, Lukens WW, Francesconi LC.
J Am Chem Soc. 2011 Oct 31. [Epub ahead of print]
PMID:
21985281
[PubMed - as supplied by publisher]
Contrast-enhanced ultrasonography for localization of pathologic glands in patients with primary hyperparathyroidism.
Agha A, Hornung M, Rennert J, Uller W, Lighvani H, Schlitt HJ, Jung EM.
Surgery. 2011 Oct 6. [Epub ahead of print]
PMID:
21982525
[PubMed - as supplied by publisher]
fac-[TcO(3) (tacn)](+) : A Versatile Precursor for the Labelling of Pharmacophores, Amino Acids and Carbohydrates through a New Ligand-Centred Labelling Strategy.
Braband H, Tooyama Y, Fox T, Simms R, Forbes J, Valliant JF, Alberto R.
Chemistry. 2011 Nov 11;17(46):12967-74. doi: 10.1002/chem.201101275. Epub 2011 Oct 4.
PMID:
21971703
[PubMed - in process] |
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