Patent ID: 7009182

Claim:
A digital pocket dosemeter for measurement of radiation dose from ionising X and Gamma radiation of energy greater than 60KeV comprising: i) detector means of the ionizing radiation comprising silicon p-n junction voltage rectifier diode with peak inverse voltage greater than 800V having sensitivity to X or Gamma radiation in the energy range 60 KeV to 1.25 MeV within ±15%; ii) CMOS charge sensitive pulse amplifier based on a CMOS inverter for amplifying said electrical impulses at low voltage and power consumption less than 0.4 mW; iii) means to reject unwanted electrical noise impulses from said electrical impulses; iv) means to achieve a calibration of one impulse per μSv; v) a discriminator threshold modulation circuit operatively connected to the said detector to achieve an uniform response for X and Gamma rays in the energy range of 60 KeV to 1.25 MeV within ±15%; vi) means to achieve linear response up to a dose rate 5 Sv/h vii) means to count said unrejected impulses; viii) means to display said count cumulatively; and ix) a compact battery power source.