Question

For Technetium-99

6. Describe Radiation and Shielding Required. How the travel distance “Radioactive” Isotope in Air, Tissue, and what would be used for Shielding? Can it penetrate through the body?
7. Are there any negative hazards with Tc-99?
8. Calculate the amount of time needed to bring the radioactivity to 25%. Show math.

Answer 1

Technetium is a silver gray, radioactive metal. It is man made. Technetium - aa is produced during nuclear reactor operation Technetium 99 can be found as a component of nuclear waste. - Air and tissue contain very law concentsation of Tc-99. Becuase of its long hala life te-aa Jound or remains in the envioonment for a long period. It can doarel Shrough Air and tissue, Becuase of its remains an entended period of time. shielding of te-aa. * Lead [pb) Hala value layer (HV2) Tenth value layer (TVD <1mm Imm. Hals value layer (HVL) is the width of a material required to reduce Me Ais kerma of a radiation to half its original value. Tenon value layer a (TVL) is the thickness os a specified material that attenuaties. radiations to an entunt such that one Ais kerma ratie, enposure rate, or absorbed a dose rate is neduced to one tenth of one value measured without the material at same point. I Technetium-aa is also lovered under Nanimum Contaminant level (MCL)

At radioactively Contaminated sites with Te-a a Contamination the primary routies of enposure to an individual are from one potential use of contaminated drinking water and ingestion of Contaminated plants. Technetium enposure may occar to persons working in research laboroat oroies that perform experiments using Tc-aqa. re te-aa cannot penedsate through the body directly. Negative Hazards once in the human body , Tc-aa Concentraties in I ne Shyroid gland and one gastrointestinal tract. The body, however concentrately encretes Tc-aa once it is ingested. As with any other radioactive matsal, there is an increased chance that cancer or other advense healon essects Gn result in from enposure to radiation. The half life of Technetium is 211,000 year using his che have to find the Amount of time needed to bring the radio activity 25%. we know, the radioactivity equation N = No e tt - cis No = initial ratie N = rate as tur a time to

No = 100% and N=25 % - T12 = 211,000 years 7=0.693 -ca) 112 eqb (1) take and logaritham on both side of rearranging it we get en I looo 1 - Tt loo - t - en (0.25) Substitute equation we get t = ln (o.am -0.693 =-1.3862 -X 211, ooo -0.693 = 4.22 089..6 h 422090 years