BIO431 Lab Report 1

BIO431 Lab Report 1 - (time half life of Cs...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Choon Liang Tan 007156760 01.14.08 BIO431 Radiation Biology Lab Report # 1 1. Table 1.1: Voltage: (V) Counts per Minute: (CPM) 700 95 720 1098 740 1204 760 1215 780 1180 800 1258 820 1238 840 1245 860 1403 Graph 1.1 – (on separate sheet) Starting Voltage = 700V Operating Voltage = 780V Plateau Region = 730V – 840V 2. Efficiency = Particles detected Particles emitted Particles detected = CPM at Operating Voltage = 1180 counts Particles emitted = Decays per Minute Activity (today) = Activity (original) x (0.5) ^
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: (time / half life of Cs) Activity (original) of Cs = 1.12 μCi Half life of Cs = 30.0 years 1 μCi = 37,000 decays per second Date of Release = April 30 th , 1985 Activity (today) = 1.12μCi (0.5) ^ (22.66 / 30) A = 1.12 (0.59231825) Activity (today) = 0.66339644 Decays per second = 0.66339644 x 37,000 Decays per minute = 0.66339644 x 37,000 x 60 = 1472740.099 Therefore: Efficiency = 1180 = 8.012275899 x 10-4 1472740.099...
View Full Document

This note was uploaded on 03/10/2008 for the course CHM 431 taught by Professor Gutnikov during the Spring '08 term at Cal Poly Pomona.

Ask a homework question - tutors are online