The Unstable Isotope ²³⁴Th Decays by β Emission with a Half-Life

question 78

Short Answer

The unstable isotope ²³⁴Th decays by β emission with a half-life of 24.5 days.The initial decay rate of the sample was 9.9 × 10¹³ Bq.(1 u = 1.6605 × 10^-27 kg)
(a)What mass of ²³⁴Th was initially present?
(b)What is the decay rate after 68 days?

---

Definitions:

Operant Conditioning

A method of learning that employs rewards and punishments for behavior, creating an association between the behavior and the consequence for that behavior.

Alcohol Use Disorders

Medical conditions characterized by an impaired ability to stop or control alcohol use despite adverse social, occupational, or health consequences.

Substance Use Disorders

Conditions in which the use of one or more substances leads to a clinically significant impairment or distress.

Purging Behaviour

Involves engaging in methods to expel food from the body, commonly associated with eating disorders such as bulimia nervosa.