Characteristics of Common Radionuclides

R/N Emission Energy Max Gamma Correction Factor Half-life Shielding Instruments (KeV) (R-cm 2 /mCi-hr) Portable Fixed C-14 Beta minus 156 NA 5730 y None GM ~ 2% LSC H-3 Beta minus 18.6 NA 12.3 y None NA LSC S-35 Beta minus 167 NA 87.4 d None GM ~ 2% LSC P-33 Beta minus 249 NA 25.4 d None GM ~ 2% LSC P-32 Beta minus 1710 NA 14.3 d Lucite GM ~ 25% LSC Ca-45 Beta minus 256.9 NA 162.7 d None GM ~ 2% LSC I-125 Gamma 35 keV (6%) 1.6 60.14 d Lead NaI ~ 8% LSC X-ray 27 keV (112%) Gamma gamma 35 keV (10%) Cr-51 Gamma 320 keV (10%) 0.18 27.7 d Lead GM ~ 2% LSC X-ray 4 keV (67%) NaI ~ 2% Gamma gamma 5 keV (20%)
R/N Beta Range in Air Beta Range in Water Dosimetry ALI Ingestion ALI Inhalation Beta Dose rate to skin from (cm) (cm) uCi uCi 1 uCi over distributed over 1 cm 2 C-14 22 0.03 None 2000 2000 1 Rad/hour H-3 0.45 0.0006 None 80000 80000 NA S-35 24 0.03 None 6000 10000 1 Rad/hour P-33 46 0.06 None 6000 8000 3 Rad/hour P-32 611 0.79 Yes -mCi quantities 600 900 6 Rad/hour Ca-45 48 0.06 None 2000 800 3 Rad/hour I-125 NA NA Yes - Iodination 40 60 NA Cr-51 NA NA Yes 40000 50000 NA
Contacts
	Overall Program Management - Debbie Hrabinski, or call (732) 445 - 2550
	Health Safety Specialists (By Campus Assignment), or call (732) 445 - 2550